问题
选择题
What makes us upset is that Tom usually does nothing but _____about so many problems. [ ]
A. complain
B. to complain
C. solve
D. to solve
答案
答案：A
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What makes us upset is that Tom usually does nothing but _____about so many problems. [ ]
A. complain
B. to complain
C. solve
D. to solve
答案：A