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。
