【題目】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“我聽到某個人正在敲門,請去看一下是誰”。hear sb doing聽到某人正在做;hear sb do聽到全過程。根據(jù)句意可知,表示聽到某人正在敲門, knocking,排除AC。第二空處,表示不知性別時,用it,故選B。

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