Life is like riding a bicycle. ______your balance, you must keep moving.A．Keepi_刷题宝

题干

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

A．Keeping	B．To keep
C．Keep	D．Being kept

上一题下一题 0.64难度单项选择更新时间:2014-06-06 04:08:03

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