Life is like riding a bicycle. your balance, you must keep moving.A．Keeping B．To keepC．Keep D．Having kept 题目和参考答案——青夏教育精英家教网—

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Life is like riding a bicycle. ________ your balance, you must keep moving.

A．Keeping B．To keep

C．Keep D．Having kept

【解析】B 考察非谓语动词。句义：生活就像骑自行车，为了保持平衡，你必须不断前进。根据句义可知此处应该使用不定式表示目的。故B正确。

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