Hewassodeepinthought，thinkingo

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更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 1993

挑错有奖

He was so deep in thought，thinking of the problem ________ he knocked into the tree without noticing it.

A．when

B．while

C．because

D．that

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A．while

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