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【题目】You have been to Singapore, for you know so much about the local customs.

A. must B. should

C. need D. can

【答案】A

【解析】考查情态动词。A. must 一定; B. should应该; C. need需要; D. can能,会。

你一定去过新加坡,因为你对当地风俗了解得太多了。此处是情态动词must have done表示对过去事情有把握的肯定推测,故选A。

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