Life is like riding a bicycle. ________ your balance, you must keep moving.
A．KeepingB．To keep
C．KeepD．Being kept
B
B　句意：生活就像在騎自行車。為了保持平衡，你必須不斷前進。根據(jù)句意可知此處需用不定式作目的狀語，故選B項。
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