Question

【题目】Tom _______in the river when he suddenly heard “Help! Help!”

A. has swum B. will swim C. swam D. was swimming

Answer 1

【答案】D

【解析】句意：汤姆正在河里游泳，这是他突然听见“救命！救命！”。根据when he suddenly heard “Help! Help!”可知此处表示过去某时正在做某事，故用过去进行时，故选D。