He was heard________ three songs in the next room.A．singB．to singC．singingD．sung_刷题宝

题干

He was heard________ three songs in the next room.

A．sing

B．to sing

C．singing

D．sung

上一题下一题 0.85难度单项选择更新时间:2013-01-26 12:26:36

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