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一 1.—He must be busy doing his homework right now. —I imagine____. A. that B. to C. so D. it 选C。I imagine so=I think so, 2. Mary had promised to give me a ticket for tomorrow. She failed, ____. A. either B. though C. but D. too 选B。结合上下文意思我们可以知道本题表示转折关系，先排除A、D；而but为并列连词通常放在句首或句子中间起连接作用。故选B。 3. When I got to the cinema, the film _____ for five minutes. A. had begun B. has been on C. has begun D. had been on 选D。电影开始了五分钟，for five minutes为一段时间要求谓语动词要用延续性动词，故A和C先排除，而从句的动作发生在主句动作之后。 4.---I wonder why Mr Green hasn’t showed up at the meeting yet. ---I’m not sure, but he _______ in a traffic jam driving here. A. could be stuck B. might stuck C. might have been stuck D. must have stuck 选C。表示对过去已经发生事情的推测应该用情态动词的完成时形式，但might的可能性不大；结合上下文的意思可以知道应该用被动形式。 | 
