___ it rain tomorrow,we would have to put off the meeting.

题目

___ it rain tomorrow,we would have to put off the meeting.
1.___ it rain tomorrow,we would have to put off
the meeting.
A.Were B.Should C.Would D.Will (上海94)
2.( )it rain tomorrow,we would have to( )the picnic
A.would;put forward B.should;call off C.were;put off D.should;put up
这两题句型没有区别.第2提一定是选C.(因为根据第2个空).那为什么第1题是选B而不选A呢.省略if should were had 都要倒装.这三者又有什么区别呢?
为什么第2题能用were 第1题不能用were

答案

should it rain tomorrow,we would have to put off the meeting.
if it should rain tomorrow,we would have to put off the meeting.
应为Were it to rain tomorrow,we would have to put off the meeting.
况且rain为动词.答案错误.
虚拟语气倒装 仅should were had 提前,其他不动.were to 与should等效用于对将来的虚拟.were,had分别表对现在、过去的虚拟.具体见虚拟语气用法及虚拟语气倒装.