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：生活就像騎自行車．為了保持平衡，你必須不斷地騎．

解答 答案A 此處是目的狀語．A、B、C和D項(xiàng)都可做狀語．但是只有不定式可以作目的狀語．故選A項(xiàng)．

點(diǎn)評(píng) 考查不定式的用法．不定式可以作很多成分，但是作目的狀語時(shí)，只能用動(dòng)詞不定式．

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