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

A．Keeping B．To keep

C．Keep D．Having kept

 

B

【解析】B 考察非謂語動詞。句義：生活就像騎自行車，為了保持平衡，你必須不斷前進(jìn)。根據(jù)句義可知此處應(yīng)該使用不定式表示目的。故B正確。

 

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