题目内容
The workers ________ the project of repairing the old building.
[ ]
A. are working on
B. are working at
C. are working over
D. are working out
答案:A
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题目内容
The workers ________ the project of repairing the old building.
[ ]
A. are working on
B. are working at
C. are working over
D. are working out