Only after the secretary saw the train disappear in sight _____ the railway station.

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问题 Only after the secretary saw the train disappear in sight _____ the railway station.

选项 A、he leaves
B、has he left
C、he left
D、did he leave

答案D

解析 本题考查倒装句的用法。only放在句子开头会引起句子的主谓倒装,only引起的倒装句为半倒装句,即助动词与主语的倒装,符合这个规律的有B项has he left和C项he left,再根据题目中的时间状语从句的提示可以知道主句应为一般过去时,两点结合可确定本题答案为D项did he leave。
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