Question

【题目】All the students were sleeping _______they heard a man _______“help”.
A.when; shouting
B.while; to shout
C.when; to shout
D.while; shouted

Answer 1

【答案】A
【解析】句意：当他们听到一个人喊救命的时候，所有的学生们正在睡觉。这里是when引导的时间状语从句，短语hear sb. doing sth.表示听见某人做某事。根据句意，故选A。