Allthestudentsweresweepingthefloor ______ theyheardaman______ "help".[ ]A.when; shoutingB.

题目简介

Allthestudentsweresweepingthefloor ______ theyheardaman______ "help".[ ]A.when; shoutingB.

题目详情

All the students were sweeping the floor ______ they heard a man ______ "help".            
[     ]
A. when; shouting          
B. while; to shout             
C. when; to shout           
D. while; shouting
题型:单选题难度:中档来源:期末题

答案

A

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