Be careful! The ice is not thick enough. You'd better on it.A. skate B. not to skateC. not skate D. not skating 题目和参考答案——青夏教育精英家教网—

题目内容

Be careful! The ice is not thick enough. You'd better ________ on it.

A. skate B. not to skate

C. not skate D. not skating

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