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  3. Only after the secretary saw the train disappear from sight_________ the railway station.

Only after the secretary saw the train disappear from sight_________ the railway station.

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问题 Only after the secretary saw the train disappear from 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 “only+状语从句”位于句首时，主句应用部分倒装结构，即将谓语中的助动词、情态动词或be动词提至主语之前。根据从句中的saw一词可知，主句应用一般过去时，所以应将助动词did提至主语he之前。故选D。
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