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3. 疑问句中的推测,往往用can或could。
Mr. Bush is on time for everything. How ______ it be that he was late for the opening ceremony?(2001年上海春季卷)
A. can B. should C. may D. must
4. 对已发生事情的肯定推测常用“must, may, might等 完成式”;否定推测常用“can, could, may, might等 完成式”。
①I was on the highway when this car went past followed by a police car. They _______ at least 150 kilometers an hour.(2005年重庆卷)
A. should have been doing B. must have been doing
C. could have done D. would have done
②He _______ have completed his work; otherwise, he wouldn’t be enjoying himself by seaside. (2005年北京卷)
A. should B. must C. wouldn’t D. can’t
③—Tom is never late for work. Why is be absent today?