(单选题)

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

A.must

B.should

C.need

D.can

参考答案：A

参考解析：

考查情态动词表推测。句意：既然你知道这么多新加坡的当地风俗，你一定去过那吧。情态动词表对过去的推测时，情态动词+have done，must表示“一定，肯定”；should表示“原本应该”；need表示“需要”；can表示客观的可能性。根据下文句意，应该是对于事实的肯定推测，所以应选择must，故选A。

知识点：

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