2. 外语
  3. He fell asleep immediately last night. He ______ very tired.

He fell asleep immediately last night. He ______ very tired.

admin2009-05-28  34
问题 He fell asleep immediately last night. He ______ very tired.
选项 A、must be
B、must have been
C、can be
D、could have been
答案B
解析 情态动词。此句是根据结果推测原因，推测做过的事情的原因用虚拟语气的形式来表示，即：must have done表示对过去事情的肯定性推测，注意其否定形式不是在must后面加not，而是用can或could来否定，称之为否定推测。
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