Only an exceptionally heavy snowfall might temporarily dislocate railway services._____ exceptionally heavily might railway services be temporarily dislocate.a. If only it snowedb. Only in case it snowsc. Only were it to snowd. Only when snowThe key of the question is c. Please explain it clearly. Thank you very very much.
參考答案:从句型的变化来看,这里肯定要选一个倒装结构。
if only不倒装,排除a;
only 放在句首,句子需要倒装,这时候是一个虚拟语气,但是在b和d 中,only只是一个修饰in case和when的副词,这两个句子的连接词是in case和when,因此不能进行倒装,排除b和d;
故选c。