语法，为什么b被排除了

smilegmat

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.

	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
	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
	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
	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
	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

答案是A  但是ab不知道怎么选

serenashu

问题应该出在for buying哪里吧，表目的用不定式to比较好吧~~