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?单数和复数在这样的情况下怎么辨别?
问题解答：
我来补答
months:
n.月
例句与用法:
1.I've been studying Spanish for three months.
我学西班牙语已经三个月了.
2.He renewed the book for another two months.
这本书他又续借了两个月.
3.The problem should have been ironed out months ago.
这个问题几个月前就该解决了.
4.After six months' work on the project,at last I feel I'm getting somewhere.
那计画我搞了半年,终於觉得有所进展.
5.He spent a few months gadding about Europe before his exams.
考试前,他在欧洲漫游了几个月.
6.He married again six months after the divorce.
他离婚后半年就又结婚了.
7.Her health has been frail for months.
她身体虚弱已有好几个月了.
8.They've been filming for six months.
他们已经拍了半年电影.
名词month:
1.one of the twelve divisions of the calendar year
同义词：calendar month,month
2.a time unit of approximately 30 days
同义词：month
