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SAT 语法!The bus would not have had to take the long detour in

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SAT 语法!
The bus would not have had to take the long detour instead of the main highway if the bridge (did not become )treacherous in the aftermath of an ice storm.
这里的括号哪里错了啊?
SAT 语法!The bus would not have had to take the long detour in
这是个虚拟语气,过去的虚拟.主句would have done,从句if+had done.虚拟语气在sat里很重要,还有现在和将来时的虚拟,一定都要会.
现在时虚拟:主句:would/could/might/should+do 从句:were/did
将来时虚拟:主句:同上.从句:were to/should/did