题目内容
Witnesses backed________from the bloody scene of the accident.
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Many great linguists have ________ most of their time and energy to the scientific study of language.
The evidence they collected ________ the previous conclusion made by scientists, which made them frustrated.
Do not ________ the differences in punctuation when you are learning a foreign language.
He was not a great original writer because he lacked the________ impulse to think out of the box.
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