同一道GWD题给了2个答案，到底该是哪一个？求助

wjk

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:
之前第一次做GWD的时候我选A，当时答案是C；今天我选C，另一套GWD中给的答案是A 到底选哪个？求助！！！感激不尽

sorcerer

恩~~~同问
再问下
none of n.
no n.
not one of n.
n.都是复数的时候的谓语形式，刚看了几个帖子看得乱了，请NN解释下

mlvince

是a吧，c    be signed 应该虚拟语气才用的吧