Only after they had discussed the matter for a few hours________a decision.
A.they reached B.did they reach
C.they reach D.do they reach
Only after they had discussed the matter for a few hours________a decision.
A.they reached B.did they reach
C.they reach D.do they reach
B 考查倒装结构。句意:只有在他们讨论这个问题好几个小时之后他们才作出决定。only修饰时间状语从句且位于句首时,主句应采用部分倒装的形式。根据状语从句的时态可以确定主句应用一般过去时态。故选B。