Jack started to speed up and I had to run to keep up in order not to ______.A．fa_刷题宝

题干

Jack started to speed up and I had to run to keep up in order not to ______.

A．fall down	B．fall behind
C．fall off	D．fall back

上一题下一题 0.64难度单项选择更新时间:2016-06-22 05:10:07

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