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

A. Keeping       B. To keep

C. Keep       D. Having kept

13.   B考查不定式短語作狀語。句意：生活就像騎自行車。為了保持平衡，你必須繼續(xù)前進。根據(jù)must keep moving可知，目的為保持平衡，表示目的用不定式。故選B。

題目來源：2015全品語法快練高中英語新課標 > 訓練18 非謂語動詞和獨立主格

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