2. 专升本
  3. Studies reveal that people spent two hours dreaming every night, no matter what they ______ during the day.

Studies reveal that people spent two hours dreaming every night, no matter what they ______ during the day.

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问题 Studies reveal that people spent two hours dreaming every night, no matter what they ______ during the day.
选项 A、should do
B、would have done
C、may have done
D、must do
答案C
解析 语法题。本题考查情态动词+完成式动词的用法。晚上做梦可能由于白天做过什么显然是对过去可能性的推测，而C．may(might)have done正是对过去可能性的推测，故选C。注意：would have done只能用于虚拟过去的动作。情态动词+完成式动词的各种含义列表如下：can／could have done：本来能做……(实际没有做)；may／might have done：过去可能做过……；needn’t have done：过去本来不必要做……(实际已做过了)；must have done：过去一定做过……(对过去绝对有把握的推测)；should have done：过去本该做了……(实际没有做)；shouldn’t have done：过去本不该做……(实际已经做过了)
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