.If we ____,we wouldn't be caught in the traffic jam now.为什么选AWe shouldn't have come south for National Holidays．If we ____,we wouldn't be caught in the traffic jam now．A.hadn't B.didn't C.wasn't D.weren't

.If we ____,we wouldn't be caught in the traffic jam now.为什么选AWe shouldn't have come south for National Holidays．If we ____,we wouldn't be caught in the traffic jam now．A.hadn't B.didn't C.wasn't D.weren't
.If we ____,we wouldn't be caught in the traffic jam now.为什么选A
We shouldn't have come south for National Holidays．If we ____,we wouldn't be caught in the traffic jam now．
A.hadn't B.didn't C.wasn't D.weren't

.If we ____,we wouldn't be caught in the traffic jam now.为什么选AWe shouldn't have come south for National Holidays．If we ____,we wouldn't be caught in the traffic jam now．A.hadn't B.didn't C.wasn't D.weren't
这里使用了虚拟语气
if从句里是had (not) do sth.,主句中是would (not) do sth.
表示对过去的事的虚拟
如果当时（没）有做某事,后来就（不）会怎样
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选A
我们就不该来南方度国庆节，如果我们没来的话，就不会困在交通拥堵中了
had 是针对上一句的have 做出的过去完成时
上一句用的现在完成时，针对现在完成时的虚拟语气，要再退一个时态，就是过去的过去

我们本不该来南方过国庆来这,要是我们不来这,我们现在就不会遇到交通拥堵.

对过去事实的假设.
其实,本题后面错了,应该是would not have been caught...出题的人垃圾

虚拟语气，对于过去的否定从句用：if xx had done sth,xx would/...... do
扩展：对于现在的虚拟 if xx did sth,xx would/...... do
将来的虚拟 if xx were to do
should do sth,
did xx would/...... do

A 如果我们曾经没做 现在就不会... 这是混合虚拟语气

常规的虚拟语气的用法，当背景是说话人对已发生在过去时间的事进行假设时，过去时的基本形式是：If(从句)主语+had done(谓语要用过去完成时态)，（主句用）主语+ would(should, might等各种过去将士来情态动词)+have done 。如果是与现在事实相反，那么：if从句中用过去时，主语+did, 主句中是主语+would/ should/ mihgt(表示过去将来的情态助词词...

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常规的虚拟语气的用法，当背景是说话人对已发生在过去时间的事进行假设时，过去时的基本形式是：If(从句)主语+had done(谓语要用过去完成时态)，（主句用）主语+ would(should, might等各种过去将士来情态动词)+have done 。如果是与现在事实相反，那么：if从句中用过去时，主语+did, 主句中是主语+would/ should/ mihgt(表示过去将来的情态助词词)+do的形式。这句中，第一句给出了已发生过的事，即，过去时了，译为：我们本不应该来南方过国庆节的（暗示实际是来过了，紧接着说“如果我们没来的话，”（这句是已发生的，所以是用过去完成时态，）我们现在就不会遇到交通阻塞了（后半句的主句有一个时间词now,就是与现在事实相反，则要用过去时）。所以说，这虚拟语气是跳层的虚拟语气，时间出现跳跃。

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