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Life is like riding a bicycle. ________ your balance, you must keep moving.
A.KeepingB.To keep
C.KeepD.Being kept
B
B 句意:生活就像在骑自行车。为了保持平衡,你必须不断前进。根据句意可知此处需用不定式作目的状语,故选B项。
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