问题
选择题
We _______ our hands while they were singing on the stage. [ ]
A. clapped
B. have clapped
C. were clapping
D. are clapping
答案
答案：C
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We _______ our hands while they were singing on the stage. [ ]
A. clapped
B. have clapped
C. were clapping
D. are clapping
答案：C