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1. The manager        a new desk,for he is preparing to apply for a patent these days (design)

那个经理一定设计了一个新的桌子,因为他这几天正准备着申请专利。

1. must have designed must have done用于对过去的事情进行肯定推测。根据下文"在申请专利"可知,新桌子已设计出来了,因此design是过去的动作。

题目来源:高考英语组合训练多项选择+完成句子 > 组合训练57-58

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