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

发布时间：2020-08-17 11:42:56

I don’t know whether you happen      it, but I’m going to study in the U.S.A. this September.
A. to be heard      B. to be hearing       C. to hear      D. to have heard

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解析：happen to have done sth 为不定式的完成时, 表示一个已经完成了的动作,强调对于现在的影响.
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