求做几题 21道1．You _____where you leave your briefcase.a.were alw

求做几题 21道
1．You _____where you leave your briefcase.
a.were always forgetting b.are always forgetting
c.have always forgotten d.will always forget
2.---I’d like to know whether the contract with us has been drawn up yet.
---It _____at the moment,Sir.
a.has been drawn up b.is drawing c.is being drawn up d will be drawn up
3.If you apply for the position,the form _______be filled and returned within two days.
a.is about to b.is going to c.has been to d.is to
4.---How many times______ you not to play with fire?
---Sorry,I won’t do so any longer.
a.had I warned b.have I warned c.am I warning d.did I warn
5.Doctors say it ______many years before scientists ______an effective treatment for AIDS.
a.is; develop b.is; will develop c.will be; will develop d.will be ; develop
6．He _____after most of the guests _____their leave.
a.had stayed; took b.stayed; took c.stayed; have taken d.had stayed; had taken
7． The spacecraft _____in space for seven days,but the flight lasted only 74 seconds before it exploded.
a.remained b.was to remain c.had remained d.was remained
8.We ______you for delivering goods to your door as long as you’ve paid in advance.
a.won’t charge b.didn’t charge c.hadn’t charged d.haven’t charged
9.In recent years,many people _____the safety of blood in blood banks.
a.have become concerned about b.have concerned about
c.became concerned about d.have become concerning about
10． Over the past few weeks barely a day _____without a vehicle breaking down on the rough road.
a.went by b.goes by c.has gone by d.hasn’t gone by
11． So far his scientific team _____little evidence to suggest that the caves might be dangerous.
a.has produced b.produced c.hasn’t produced d.did not produce
12.Since the drought began many farmers _____one harvest after another,unable to plant wheat on the land.
a.have been missed b.are missing c.have missed d.missed
13 This is the second time we ______improvements in that machine.
a.have made b.will make c.make d.are making
14． The old lady _____her husband that she _____nearly half of their savings into the stock market.
a.hasn’t told ;had sunk b.didn’t tell; had sunk
c.hadn’t told ; sank d.doesn’t tell; had sunk
15．Growing evidence suggests that women ______to have sleep problem.
a.should be more likely b are more likely c.will be more likely d.is more likely 16．We are faced with the conclusion that during the past three decades the storm ______almost
Twice as destructive.
a.have been grown b.have grown c.are growing d.are being grown
17．Scientists have known about the link between smoking and lung cancer for decades,but cigarette use _______.
a.is hardly decreased b.is hardly decreasing c.has hardly decreased
d.was hardly decreasing

1d 2d 3c 4b 5a
6b 7b 8a 9d 10a
11c 12a 13c 14a 15b
16b 17d