I don’t know whether you happen ______ ,but I’m going to study in the U．S．this September
A.to be heardB.to be hearingC.to hearD.to have heard在线课程D
本题考查不定式的时态辨析。句意为“我不知你是否已听说了……”, 要体现不定式的动作先于谓语动词发生或者应该已发生, 不定式要用完成形式。
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