题目内容
【题目】—Have you ever been to Wang Lihong's concert?
—Yes, and I saw him _______ the piano as he sang.
A.play
B.plays
C.played
D.to play
【答案】A
【解析】see sb. do sth.表示 看见某人做了某事, 强调看见谁做过什么事. see sb doing sth 表示看到某人正在做某事, 强调看见某人正在做某事。所以答案是A
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