SAT两道ISE的题，急！在线等！！

以下括号部分为画线部分选项：
1）<Had it not> been for two particularly skillful members of the work crew, we could not have completed the apartment renovations on schedule. <NO E>
这题NO E， 但是就是我不知道had it not和后面的could not have时态难道没错吗??had it not been 不应该是过去完成时吗？

2)<Had I known >that the line to get into the movie <would be> so long. I <would of> left earlier to get to the theater or <bought> my ticket online. <NO E>
这题选C，我不知道怎么改。

3）还有就是我搞不清出现 until 到底是用什么时态？？？

1，虚拟语气，表示与过去事实相反的假设及相应的结果。
与过去相反：If + sb/ sth + had done...sb/sth+ coud/ would/ might/ should (not) have done....
这里的虚拟条件句省略了 if-, 故引起倒装 = If it hadn't been for...
情态动词的完成式就是它们的“过去式”。所以，没有错。
2、第二句的道理与1一样。Had I known that- = If I had known that-
3. until- 属于时间状语从句，和before-,after-, when-,if-的用法一样，也遵循“主将、从现"原则，如果主句是一般现在时的话，其他情况要看具体语境。

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