题目

Though I have often heard this song _______. I have never heard you _______ it. A. being sung, sang       B. sang, singing C. sung, sing   D. to be sung, to sing 答案：C 解析: C。第一空填 sung，因为 song 与 sing 是被动关系；第二空填 sing，因为 you 与 sing 是主动关系。

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