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--_______three more days enough for the work to be finished?

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--_______three more days enough for the work to be finished?
a.Are
b.Is
--_______three more days enough for the work to be finished?
Is.
动词用单复数看主语,这个大家都知道.
凡是表示一个概念性的东西,一种整体的概念,就是具备单数的性质,比如
1.100 RMB is too much for that hat.那顶帽子不值100元.
2.1000 miles is quite long for those tired-out players.
1000英里对于那些已经精疲力尽的选手来说,相当的远了.
这里three more days,相当于 another three days,表示一个“三天时间”的整体概念,所以动词用单数!