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It's unlikely that either runner is able to this quick pace. [ ] A. keep on B. k

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It's unlikely that either runner is able to this quick pace. [ ] A. keep on B. k

It's unlikely that either runner is able to ________ this quick pace.

[]A.

keep on

B.

keep off

C.

keep up

D.

keep down

试题答案

答案:C