gwd 2-3 还是不懂啊!请教nn

Q3:

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,为什么不选b 呢? 觉地c were用错了

其次，没有make sth for doing sth的说法

先谢谢大家啊! 觉地都蛮有道理的,看了一下B和C的区别特别是那个make sth for doing 算是搞清了

突然又发现了A和C 又混了

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

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

为什么一个用is 一个用be 算虚拟吗 觉得them是好象没有指代对象,到底选A还是选C

各位nn帮帮忙啊!

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

为什么一个用is 一个用be 算虚拟吗 觉得them是好象没有指代对象,到底选A还是选C

各位nn帮帮忙啊!

偏向 A

UNTIL后面没有理由用BE啊，代词指代 investors 的话觉得啰嗦。被动强调结果，不需要指出执行者。