I was wondering why suddenly the lift was not ___ properly.

I was wondering why suddenly the lift was not ___ properly.
A.operating on B.operating C.managing D.controlling
一定要说出为什么!

miniseven 1年前已收到2个回答举报

guobao1216 幼苗

共回答了20个问题采纳率：95% 举报

B operating
operate有运行,运作的意思.
本句是过去进行时,缺一个ing 分词,句意为：我一直在想为什么电梯突然会无法正常工作了.
manage是处理,管理,control是控制的意思

1年前

等雪的人1 幼苗

共回答了2个问题举报

1年前

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