问题: 请教一个英语问题！！
I would have been there on the spot (2)the traffic problem.
it had not been for
if it were not for
if not for
had it not been for
请问（2）处应该选填以上4个中的哪个？为什么？？
解答:
选D啦，正常的句子应该是：
I would have been there on the spot if it had not been the traffic problem.
这是的虚拟语气，可以省掉if,句子就要倒装，had 提前。
这里属于过去时，主句要用would have,从句要用过去的过去had.
C中were仅表示过去式。
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