______ the train station, he waved again and again to me.

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问题 ______ the train station, he waved again and again to me.

选项 A、Leaved
B、To leave
C、Lea
D、When leaving

答案D

解析 强调与谓语动词的动作同时发生时,现在分词前可用连词when。答案为D。
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