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【题目】Eight months ought to be enough for you to finish this paper, ____________?
A.oughtn't they
B.didn't they
C.shouldn't it
D.shouldn't they

【答案】C
【解析】句意:八个月对你完成论文应该足够了,是吗?陈述句中含有情态动词ought to时,附加疑问部分既可以使用oughtn't+主语,也可以使用shouldn't+主语;又因"八个月"表示一段时间,为单数,要用it指代。故选C。

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