求详解.1.How long do you suppose it is(D)he arrived there?A.whe

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求详解.
1.How long do you suppose it is(D)he arrived there?
A.when B.before C.after D.since
2.When I arrived,the meeting(C)for ten minutes.
A.had begun B.began C.had been on D.have been on
3.Dalian is (C)the most beautiful cities of China.
A.belonged to B.belonging to C.among D.considered as
4.The boy threw a stone into the river which(B)the smooth surface of the water.
A.broke B.disturbed C.bothered D.interrupted
5.(A)reading is faster than reading aloud.
A.Silent B.Still C.Quiet D.Calm
6.It's nearly seven o'clock.Jack(C)be here at any moment.
A.must B.need C.should D.can 为什么不选D
7.

1.It is +时间 +since . 意思是：自从.以来多长时间了.其中do you suppose 是插入语.
2.表示过去的过去,用过去完成时态.
3.among指三者以上之中,而大连也只能是最美的城市之一.
4.disturb指打扰,弄乱；别的动词没有这个意思.
5.silent reading 指不出声的阅读,与大声朗读相对应,
6.should 表示可能性较大的一种推测.can 可能性较小,从nearly seven o'clock可以看出.

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