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问题

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
正确答案是:
同类题型

She is _____ newcomer to _____chemistry but she hasalready made some important discoveries.

This old man is ____ in the small village, just 2 years younger than Tom’s grandpa.

The new government was not ________ by its people for its unreasonable policies.[ ]

d man was quite weak after theaccident, so he______.

The film is really touching, isn’t it— I saw most of the audience crying at the end.

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