Mr.Smith ___here for about two hours.

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Mr.Smith ___here for about two hours.
A.has left B.left from C.went away from D.has been away from
They have been skating __.
A.for three hours ago B.since three hours ago
C.three hours ago D.since three hours
应该选哪个?为什么请把每道题的答案做下分析

1.D 抓住关键 for about two hours,用完成时.
2.B
完成时中
for 后面跟一段时间词( three hours,a year,a month.)
而since 后面跟时间状语(three hours ago,a year ago,a month ago)注意区别.

Mr.Smith ___here for about two hours. Mr.Smith ___here for about two hours.A.has left B.left from -Mr Smith,how long ( ) you ( ) this company?-For about two m mr wang rode for about two hours to get to the palace museum tom_____from here for about two hours.(be away) we have been there for about two hours. They walk down the street for about two hours.(对for about tw 几道英语题1.Mr.Smith does （two） hours of sport every day.对划线部分提问2 the trip is about two hours.划线about two hours Its about two hours drive about怎么用：He can get up for about two hours each day Is Mr.Smith still in Shanghai?—Yes,he ______ there for two m