新prep217 不明白为什么用虚拟语气，求教~~

擎天柱

217.(T-3-Q17) (天山-7-14)Not one of the potential investors is expected to make an offer to buy First Interstate Bank until a merger agreement is signed that includes a provision for penalties if the deal were not to be concluded.

A.is expected to make an offer to buy First Interstate Bank until a merger agreement is signed that includes a provision for penalties if the deal were

B.is expected to make an offer for buying First Interstate Bank until they sign a merger agreement including a provision for penalties if the deal was

C.is expected to make an offer to buy First Interstate Bank until a merger agreement be signed by them with a provision for penalties if the deal were

D.are expected to make an offer for buying First Interstate Bank until it signs a merger agreement with a provision for penalties included if the deal was(A)

E.are expected to be making an offer to buy First Interstate Bank until they sign a merger agreement including a provision for penalties if the deal were！
不是特别明白为啥用虚拟语气，如果A中were改成was还对吗？非常感谢！！！

cdy1234567

he/she/it

擎天柱

首先排除DE，SV agreement...
然后排除B，expected to...
A与C之间的区别就是“is signed that includes”和“be signed by them with”，be signed是虚拟语态（sunjunctive）需要从句才能使用，而且用them指代让人有嫌疑。
所以我选A啦。

A中were改成was不对，条件式（conditional）if+三单+were是定律。

-- by 会员 cdy1234567 (2011/4/1 23:25:40)

嗯，非常感谢！这个思路很棒~~~~我想问下“三单”是指？单数？

擎天柱

非常感谢，明白了，真是大牛，一语点破！我一直不适很理解虚拟语气刚才还百度了一下……

cdy1234567

首先排除DE，SV agreement...
然后排除B，expected to...
A与C之间的区别就是“is signed that includes”和“be signed by them with”，be signed是虚拟语态（sunjunctive）需要从句才能使用，而且用them指代让人有嫌疑。
所以我选A啦。

A中were改成was不对，条件式（conditional）if+三单+were是定律。

cycyang

"...includes a provision for penalties if the deal were not to be concluded“如果交易没有达成，将会受到相应的惩罚。
这只是一种假设，并不希望事实如此，所以用虚拟。即使不用虚拟，至少不应用过去时，而是一般现在时。