You must ______ that the power is off before you leave the lab.A．checkB．knowC．de_刷题宝

题干

You must ______ that the power is off before you leave the lab.

A．check

B．know

C．decide

D．examine

上一题下一题 0.64难度单项选择更新时间:2014-06-26 04:14:20

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