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
题目分析：考查only的倒装。Only倒装要符合两个条件：only放在句首；后面强调状语；本题都符合，only放在了句首，强调的是时间状语after they had discussed the matter for several hours，故使用部分倒装的形式。根据时态，可知使用过去时，排除D项。
点评：。Only倒装要符合两个条件：only放在句首；后面强调状语；