If we can keep this speed, we'll arrive there in two or three hours.A．onB．toC．upD．at 题目和参考答案——青夏教育精英家教网——

题目内容

If we can keep _____ this speed, we'll arrive there in two or three hours.

A．on

B．to

C．up

D．at

C

keep to 遵守，keep at 继续、坚持；keep up 保持

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