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Life is like riding a bicycle. ________ your balance, you must keep moving.
A.KeepingB.To keep
C.KeepD.Having kept
B
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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