好心人帮我解答GWD上的题 谢谢

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.

1. 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
2. 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
3. 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
4. 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
5. 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

   Answer: c

请问这题我为什么是c？ 我觉得C很怪~~

一开始也选错，LZM的解释是IF后面用了were表示虚拟，所以前半句a merger agreement be signed 也用虚拟，省略shall. 因为make an offer 的条件是sign a merger agreement.

原来是这样。。。

谢谢！

还是有疑问，if虚拟语气，主句为什么能省略should??

表示：建议，命令，要求才能省略should阿

except不能省略should的。

省略shall. 因为make an offer 的条件是sign a merger agreement    这个解释不明白