Question

【题目】I heard Tom ________ when I walked past his room yesterday.

A. sing B. singing C. to sing D. sang

Answer 1

【答案】B

【解析】句意：昨天当我走过汤姆的房间时，我听见他正在唱歌。根据when I walked past his room yesterday.可知此处表示当时听见他正在唱歌，hear sb doing sth听见某人正在做某事，故选B。