I don’t know whether you happen ______ but I’m going to study in the U.S. A. this September.

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问题 I don’t know whether you happen ______  but I’m going to study in the U.S. A. this September.

选项 A、to be heard
B、to be hearing
C、to hear
D、to have heard

答案D

解析 happen to have done表示碰巧已经做过某事,符合此句的含义。A项的不定式表示“将来被听到”;B项表示“正在听到”;C项的不定式表示“将来听到”,均不符合对过去的一种陈述,不符合题意。
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