Do you know the stages every inventor must ________ before they can have their i

题干

Do you know the stages every inventor must ________ before they can have their invention________ .

A．go through; approve	B．go through; approved
C．get through; approval	D．look through; approved

上一题下一题 0.4难度单项选择更新时间:2012-07-24 10:29:03

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