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

Correct Answer：C

One of +复数名词，谓语动词不是应该用复数才是吗？可是C中的is是怎么回事啊？大家来帮忙~~~~~~~~~~谢谢！！！

One of +复数名词，谓语动词不是应该用单数

但是until a merger agreement be/is signed

为什么用is不对，从句用一般现在时才对阿？难道是跟be expected有关？

 c没有错，应该用is。

One of 后＋谓语动词（Vt)单数还是复数要根据如下情况:

one of + 名词复数＋Vt单数－－－－－－－－－Vt动作的发出者是one，当然是单数

one of + 名词复数+ that+Vt复数－－－－－－－这个Vt动作的发出者是that，that就近修饰名词复数，故Vt是单数格式

the only one of + 名词复数＋that＋Vt单数－－－这个Vt动作的发出者是that, that 修饰 the only one，是单数，故Vt是单数格式

How to distinguish A and C?

A 中的that指代agreement 是有这种用法的，

C 中的is expected to make an offer to buy First Interstate Bank until a merger agreement be signed by

为什么会用Be ？谢谢

不明白c选项为什么是be signed by them？表被动只用signed不就行了吗？而且为

什么要是be而不是is呢？