分析英语语法选择题“Two hours ___ long enough for you to finish your h

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分析英语语法选择题“Two hours ___ long enough for you to finish your homework”
1.Two hours ___ long enough for you to finish your homework.
A.is B.are C.has D.have(正解A)
2.A seven-day holiday _________ long enough to have a good rest and travel the province.
A.is B.are C.has D.have （正解A）
我想知道为什么.这种句型的BE动词什么情况用什么形式?

这种情况是因为two hours 和a seven-day holiday 表示的都是一个时间段,所以用单数形式.
如果强调的是几个月或几年要用复数.
比如there are 3 days to go.(还剩三天）之类的,就用复数.

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