-Science is so difficult! -I think you should keep on hard. A. study B. to st——青夏教育精英家教网——

摘要： -Science is so difficult! -I think you should keep on hard. A. study B. to study C. studying

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— Science is so difficult!
— I think you should keep on _____ hard.

[ ]

A. study
B. to study
C. studying

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－Science is so difficult!

－I think you should keep on ________ hard．

A．study

B．to study

C．studying

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