Four months __ passed by since we met last time.Four months ___ a short time.

问题描述:

Four months __ passed by since we met last time.Four months ___ a short time.
a.has; isn't b.have; isn't
选A,第一个空可以看作整体,也可以肯做个体吧?用have也可以的吧?

has 四个月是一个时间概念上的整体.说的是一个事情,所以用has,
你看后边的空,两个都是isn't 选项中就把答案告诉你了.