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

题目简介

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

题目详情

He was so deep in thought,thinking of the problem ________ he knocked into the tree without noticing it.
A.whenB.while
C.becauseD.that
题型:单选题难度:偏易来源:不详

答案

D
解析 考查状语从句的引导词。so...that...表示“如此……以致……”,引导结果状语从句。句意为:他思考问题太投入了,以致一不留神儿撞到了树上。

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