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【题目】I don't know whether you happen ____ it, but I'm going to study in USA this September.

A. to be heard B. to be hearing

C. to hear D. to have heard

【答案】D

【解析】

考查不定式的时态辨析。整句话的意思是我不知你是否已听说了……”。要体现不定式的动作先于谓语发生或者应该已发生,不定式要用完成形式。故选D。

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