---I have worked hard at English, but it seems that I haven’t made any progress.

---Keep on _____ at it, and you will be successful.

A．work            B．working             C．to work           D．works

1、B

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---I have worked hard at English, but it seems that I haven’t made any progress.

---Keep on _____ at it, and you will be successful.

A．work            B．working             C．to work           D．works

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