once bitten, twice shy. 一朝被蛇咬,十年怕井绳。
7 The thief tried to open the locked door but _B_.
A in no way B in vain C without effect D at a loss
in vain 徒劳,白费工夫; But很少与介词without联用; at a loss 不知所措。
8. _B_ seeing the damage he had done, the child felt ashamed.
A By B On C At D For
on后面加动词ing形式表示 在 之后 这个时间概念。
9. Research findings show we spend about two hours dreaming every night, no matter what we _C_ during the day.
A should have done B would have done C may have done D must have done
should have + 动词过去分词,表示本应该做; may have + 动词过去分词,表示可能做过;
与过去事实相反的虚拟语气主句谓语动词的表达形式可能用到:would have + 动词过去分词。
must have + 动词过去分词,表示对过去行为进行肯定推测。表示一定做过;
cant have + 动词过去分词,表示对过去行为进行否定推测,表示不可能做过。
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