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The problem requires . A. studying with great care B. to study carefully C. to be studied without carelessness D. taking great care of studying it 【查看更多】

 

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The problem requires ______.

     A. studying with great care                   B. to study carefully

     C. to be studied without carelessness           D. taking great care of studying it

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 The problem requires ______.

A．studying with great care

B．to study carefully

C．to be studied without carelessness

D．taking great care of studying it

 

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