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14.Life is like riding a bicycle._____ your balance,you must keep moving.(  )
A.To keepB.KeepingC.Being keptD.Having kept

分析 句意:生活就像骑自行车.为了保持平衡,你必须不断地骑.

解答 答案A 此处是目的状语.A、B、C和D项都可做状语.但是只有不定式可以作目的状语.故选A项.

点评 考查不定式的用法.不定式可以作很多成分,但是作目的状语时,只能用动词不定式.

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