问题
选择题
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
答案
答案：B
考查Only的倒装句。Only放在句子，且强调状语的时候，后面的主句使用部分倒装句。句意：只有他们讨论那个事情几个小时以后，才得出一个决定。