问题: 请教几个英语单选题（10）
请说明原因。
46 . The store had to ___________ a number of clerks because sales were down.
A. lay out
B. lay off
C. lay aside
D. lay down
47 . The students was just about to _____ the questions, when suddenly he found the answer.
A. arrive at
B. submit to
C. work out
D. give up
48 . _____ for my illness I would have lent him a helping hand.
A. Not being
B. Had it not been
C. Without being
D. Not having been
49 . The room is in a terrible mess; it _________ cleaned.
A. can’t have been
B. mustn’t have been
C. shouldn’t have been
D. wouldn’t have been
50 . I used to smoke ____ but I gave it up three years ago.
A. seriously
B. heavily
C. badly
D. severely
解答:
46.B解雇
47.D放弃
48.B虚拟语气.后面有WOULD HAVE DONE过去现在完成时,前面用过去完成时.
49.C虚拟语气.SHOULD表猜测.
50.B固定搭配.
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