问题
选择题
Don't go to open the door at once when the door bell _____.You should ask who it is at first. [ ]
A. run off
B. set off
C. go off
D. put off
答案
答案：C
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Don't go to open the door at once when the door bell _____.You should ask who it is at first. [ ]
A. run off
B. set off
C. go off
D. put off
答案：C