问题
选择题
The math teacher gave us some exercises, and he asked us at once. [ ]
A. to work them out
B. working them out
C. to work on them
D. working on them
答案
答案：A
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The math teacher gave us some exercises, and he asked us at once. [ ]
A. to work them out
B. working them out
C. to work on them
D. working on them
答案：A