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I doubt whether he can his efforts much longer as he looks so tired. A. keep on

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I doubt whether he can his efforts much longer as he looks so tired. A. keep on

I doubt whether he can ______ his efforts much longer as he looks so tired.

A. keep on                B. keep up             C. keep back          D. keep from

试题答案

B

标签：effortshislongermuchwhether

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