SAT语法题 08.1-18The 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.did not become 错了 为什么?

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SAT语法题 08.1-18The 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.did not become 错了 为什么?
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SAT语法题 08.1-18The 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.did not become 错了 为什么?
SAT语法题 08.1-18
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.
did not become 错了 为什么?

SAT语法题 08.1-18The 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.did not become 错了 为什么?
这道题考的是过去时态的虚拟语气,从前面用的是would not have had 可以知道.所以应该把did not become改成had not become.这种题很容易的,只要记住规律就可以了,几乎每套题都有.
加油,我也在备考sat!

应该用虚拟吧 因为确实发生了