He switched off the light and was about to leave the classroom and only then to rain heavily.A. did

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【题目】He switched off the light and was about to leave the classroom and only then ________ to rain heavily.

A. did it begin B. it began

C. does it begin D. it begins

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【答案】A

【解析】

试题分析：句意：他关掉灯，正准备离开教室，就在这时，天下起了大雨。Only修饰状语，后面的主句要部分倒装，故选A。