问题
选择题
We ________ our hands while they were singing on the stage.
A．clap
B．have clapped
C．were clapping
D．are clapping
答案
答案：C
while引导的从句常用过去进行时。
搜题请搜索小程序“爱下问搜题”
We ________ our hands while they were singing on the stage.
A．clap
B．have clapped
C．were clapping
D．are clapping
答案：C
while引导的从句常用过去进行时。