问题

Only then ___ that he had made a mistake.
A:he realized
B:did he realized
C:realized he did
D:did he realize
B:did he realized
C:realized he did
D:did he realize
正确答案是:
同类题型
ith their business, they had no time to ______ their wedding, so they had it organized by a company.
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ut of here at once _________ not, I’ll phone thepolice
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