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[tc1] 
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

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

The answer should be C,

"Xu Ni Yu Qi" ,

(sorry, I  can not type Chinese on my school PC).

第一、為什麼要用"be" signed??

第二、就我對句意的理解，agreement是不是應該不是由investors簽的，應該是由Bank簽的，若是由investors簽的，那這句的邏輯豈不是有點怪，要我提出offer的先決條件是要我自己先簽一份同意我自己受罰的agreement!!