【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
在线课程【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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