我说说我的思路：ＡＢＣ不知道选哪个好，知道for 没有to好 但是有不知道这里是不是虚拟语气，所以不知道是were还是was 望赐教！！！
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
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 | 
