题目内容
Only when _______ to explain _______ the reason for this.
A. did he start; she realized
B. he started; did she realize
C. did he start; she had realized
D. he started; had she realized
【解析】选B。考查倒装语序。此处为only+状语从句置于句首,主句使用倒装语序。D项主句时态使用错误,故选B。
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