问题补充:
单项选择题:
Weon this project for four hours. Lets have a rest.
A.are working B.have been working C.worked D.had worked
答案:
答案:B
解析:本题考查动词的时态,由“four hours”可知应用完成时态,排除A和C:由“Lets have a rest”可知工作还没完,因此应该用现在完成进行时。故选B。
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