问题
选择题
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
答案
答案：A
搜题请搜索小程序“爱下问搜题”
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
答案：A