就一道语法题.1._____ exceptionally heavily might railway services

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/10 11:06:11

就一道语法题.
1._____ exceptionally heavily might railway services be temporarily dislocated.
A.if only it snowed B.Only in case it snowes C.Only were it to snow.
请问为什么答案是C,请问具体其它的答案为什么不对,要怎么改才对,

省略加倒装了,原为：only if it were to snow,这是if虚拟条件句,所以主句用了might,表示和将来事实不符.另外might提前是因为only+状语放在句首,句子须倒装.
if虚拟条件句：和将来事实不符,从句用一般过去时或were to do或should加动词原形,主句用would/might/could/should加动词原形.其中,当用were to do或should的时候,从句可省略if把were或should提前到主语之前.当表示和过去事实相反时,从句用过去完成时,也可同样变为had提前到主语之前.

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