______, they waved again and again to us.A、When leavingB、To leaveC、Being leavi

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问题 ______, they waved again and again to us.

选项 A、When leaving
B、To leave
C、Being leaving
D、Having left

答案 A

解析有些表示时间、地点、条件、方式或让步等的状语从句中，如果谓语包含动同be，主语又和主句的主语一致，或者主语是it，就常常把从句中的主语和谓语的一部分(特别是动词be)省略掉。此句实际上是：When they were leaving，they waved…

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