-___one and a half days enough for the painting to be finished?

题目

-___one and a half days enough for the painting to be finished?
-I don't think it's enough and only after __go on with it.
A Is ;will he recover he can B Are;he recovers can he
C Are;he recovers he can D Is;he recovers can he
主要是BD的问题,第一空为什么用IS不用ARE?

答案

这个主要是因为它将one and a half days 看成一个名词主语来看待,一天半的时间是否足够完成这个绘画?强调这个时间内,所以才用单数,不然一般是用复数的Are了.