题目内容
5.Sam was sure that his wallet musthave been picked (pick) up by one of the villagers.分析 Sam肯定他的钱包肯定是被其中的一个村民捡去了.
解答 答案是have been picked.本题考查must have done;must have done表示"肯定已经…",表示对过去的或已经发生的事件的肯定推测;由上文的was sure判断,Sam认为钱包"肯定已经"被某个村民捡去,故答案是must have picked.
点评 本题是要求用所给动词的适当形式填空,解题时首先考虑句中需要的是谓语动词还是非谓语动词;其次,如果是谓语动词关注时态、语态和数的变化;如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式.

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