GWD VERBAL2 Q3

nolanchen

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

我选A, 但GWD参考答案是C,为什么C选项until引导的从句要用动词原形be signed?这里又不涉及虚拟语气?

[此贴子已经被作者于2006-6-20 12:00:03编辑过]

carolhide

恳请LZ在标题中标明题号，以便惠及后人，谢谢配合！