He switched off the light and was about to leave the classroom and only then____ to rain heavily. A....
2022-09-19 19:56:31 34次 江苏省2019届高三上模考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
He switched off the light and was about to leave the classroom and only then____ to rain heavily.
A. it began B. it begins
C. does it begin D. did it begin
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