问题补充:
Only when .
A. did he arrive the meeting began
B. he arrived did the meeting begin
C. did he arrive the meeting begin
D. he arrived the meeting began
答案:
A. did he arrive the meeting began
(答案→)B. he arrived did the meeting begin
C. did he arrive the meeting begin
D. he arrived the meeting began
解析:only引导的状语位于句首,主句用部分倒装。故选B。