Question

【题目】I hear someone _______ the door. Please go and see who it is.

A.knock atB.knocking inC.knock inD.knocking at

Answer 1

【答案】D

【解析】

句意：我听见有人正在敲门，去看看是谁。

本题考查动名词词组作补语。根据“Please go and see who it is.” “去看看是谁”，可知是我听见有人正在敲门，hear sb doing sth，排除A,C；敲门是knock at the door，结合选项，应该是knocking at the door，故选D。