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

游客2024-07-09  5

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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