12、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
科目：高中英语 来源： 题型：
8. 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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源：四川省资阳市2010届高三下学期第二次模拟考试 题型：单选题
8. 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 |
科目：高中英语 来源：2013-2014学年高考二轮复习训练：专题7 并列句与状语从句英语试卷（解析版） 题型：单项填空
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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