问题
选择题
Stop ______ about the traffic. Just think about what we can do to improve it. [ ]
A. complain
B. to complain
C. complaining
D. complained
答案
答案：C
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Stop ______ about the traffic. Just think about what we can do to improve it. [ ]
A. complain
B. to complain
C. complaining
D. complained
答案：C