_____ for the free tickets,I would not have gone to the film so often._____ for the free tickets,I would not have gone to the film so often.A if it is notB had it not beenC were it not为什么要一个be（been）
问题描述：
_____ for the free tickets,I would not have gone to the film so often.
_____ for the free tickets,I would not have gone to the film so often.
A if it is not
B had it not been
C were it not
为什么要一个be（been）
答
虚拟语气，省略了if
If it had not been for the free tickets,。。。。
因为都是与过去相反的，所以从句中用过去完成时，主句中用过去将来完成时
答
后半句可以看出这是一个与过去事实相反的虚拟条件句，从句中的动词要用“had ＋过去分词”，如果将if省略，had要位于主语之前，构成倒装句.B
答
因为这个句子是虚拟语气吧
从句时态要降级，would可以看出主句是过去时，所以从句就要时态降级，用过去完成时咯
答
这是固定结构，与but for 一样，记住就行了
答
if it wasn't/weren't for… used to say that sb/sth stopped sb/sth from happening 意思是：若不是（某人/某事）；幸亏是虚拟语气,上面那个是对现在情况的假设如果是对过去情况的假设,就要把wasn't/weren't改成ha...