The project is so designed that once _______ nothing can be done to change it．A．_刷题宝

题干

The project is so designed that once _______ nothing can be done to change it．

A．starts

B．having started

C．started

D．starting

上一题下一题 0.85难度单项选择更新时间:2010-07-02 08:05:01

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