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( )it rain tomorrow,we would have to( )the picnic

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( )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
C
这是个虚拟语气,是一个疑问句,对未来的虚拟,主句用的是would have done的形式,谓语动词用过去式,正常的陈述句语序为:We would have to put off the picnic(if) it were rain tmmorrow.
应该就是啦,根据第二个空的意思,用排除法也是选C的