问题
Only when _______ home_____ that he had left his bag in the taxi he had taken.
A:he returned; did he realize
B:did he return; did he realize
C:he returned; he realized
D:did he return; he realized
B:did he return; did he realize
C:he returned; he realized
D:did he return; he realized
正确答案是：
同类题型