英语语法求救____ it rain tomprrow ,we could have to put off visiti

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英语语法求救
____ it rain tomprrow ,we could have to put off visiting Beijing.
A,Were B,Should C,Would
选择什么?为什么呢?

____ it rain tomorrow ,we could have to put off visiting Beijing.
A,Were B,Should C,Would
选择什么?为什么呢?
答：B
翻译：万一明天下雨的话,我们就可能得推迟游览北京.
分析：本题考虚拟将来条件句,通过倒装省略if.与将来情况很可能相反的假设,if从句的谓语动词有三种形式：1）should +V,2).were to +V,3).过去式.前两种可通过主谓部分倒装来省略if.如rain前有to,则选A.Should it rain tomorrow= If it should rain tomorrow,
评题：主句的could应改为might（就可能）或would（就会）.could 表示“就能够/就可以”,好象希望这样,但have to又表示不愿,是矛盾的.
主句用could的例句：Should it snow tomorrow,we could ski.(=If it should snow tomorrow,we could ski.) 要是明天下雪,我们就可以滑雪了.

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