问题
选择题
Only after they had discussed the matter for several hours ______a decision.
A．they reached
B．did they reach
C．they reach
D．do they reach
答案
答案：B
考查倒装句。Only的倒装有两个条件：only放在句首，且强调状语时，后面使用部分倒装。本题两个条件都符合。句意：只有在他们讨论这个问题几个小时以后他们才得出结论。