题目内容
【题目】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
【答案】D
【解析】结果状语从句。so...that...表示“如此……以致……”，引导结果状语从句。句意：他思考问题太投入了，以致一不留神撞到了树上。
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题目内容
【题目】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
【答案】D
【解析】结果状语从句。so...that...表示“如此……以致……”，引导结果状语从句。句意：他思考问题太投入了，以致一不留神撞到了树上。
