问题
选择题
The windows _____, so you need not wash it again.
A．is washed
B．was washed
C．have been washed
D．will be washed
答案
答案：C
考查谓语动词。The windows作主语谓语应用被动语态，根据语境you need not wash it again “不必洗”所以应用完成时的被动语态选C
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