单项选择题

It’s more difficult to solve a problem than（）

A. a question is found
B. finding a question
C. that of finding a question
D. to find a question

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单项选择题
His sprained ankle () his chances of winning the tournament.

A. damaged
B. broke
C. ruined
D. demolished
单项选择题
It is impossible that the brain,（）, will be replaced by computer

A. as we know
B. which we know
C. we know that
D. we know
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