217.

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

最后基本能够锁定在AC之间，但是不明白A怎么被排除的？ 为什么C里用了原型be？

网上的解释是expect  to 后边连接原型，以便平行。

原文：

"Not one of the potential investors" is singular, so "is" must be used rather than "are". So D & E are out.

When using "if" in this case, were must be used always (for example "if I were....", "If you were...", "If he were... , "If it were"). So B is out.

Finally, in "is expected" is subjunctive, so it hould use the verb infinitive. In this case should be "is expected to make .... until .... be ....". (make and be parallel). So C is the choice. (A uses "make" and "is").

但仍旧怀疑。

not one=none 可以查Longman有的

选A