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【题目】I hear someone____at the door.Please go and see who_____is

A. knock;it B. knocking;it C. knock;he D. knocking;he

【答案】B

【解析】

句意“我听到某个人正在敲门,请去看一下是谁”。hear sb doing听到某人正在做;hear sb do听到全过程。根据句意可知,表示听到某人正在敲门, knocking,排除AC。第二空处,表示不知性别时,用it,故选B。

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