问题
选择题
(2013·凉山一模)Life is like riding a bicycle. ________ your balance, you must keep moving.
A．Keeping
B．To keep
C．Keep
D．Being kept
答案
答案：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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