only after they had discussed the matter for several hours _b.did they reach____ a decision.
他们在这个问题上讨论了几个小时才下了决定.
以 only 开始的句子,谓语要用倒装.所以只能选B或D,因为是had discussed 过去式,所以选B
only after they had discussed the matter for several hours _b.did they reach____ a decision.
他们在这个问题上讨论了几个小时才下了决定.
以 only 开始的句子,谓语要用倒装.所以只能选B或D,因为是had discussed 过去式,所以选B