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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
查看习题详情和答案>>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
查看习题详情和答案>>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
查看习题详情和答案>>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
查看习题详情和答案>>
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 |