题目内容
6、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
试题答案
6、C
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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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