单项选择题

That she hadn't kept her () on her work resulted in the failure.

A. head
B. heart
C. brain
D. mind

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单项选择题
—What did Maria say — ().

A. Maria said that she likes their uniforms.
B. Maria said that she doesn't like their uniforms.
C. Maria said that she didn't like their uniforms.
D. Maria said that she was like their uniforms.
单项选择题
If Newton lived today, he would be surprise by what () in science and technology.

A. had discovered
B. had been discovered
C. has discovered
D. has been discovered
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