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Only when our project has been approved of by the committee ______ to carry it out.

A. did we start B. we started

C. can we start D. we start

C

【解析】

试题分析:考查强调句。句意∶只有我们的计划被委员会证明我们才能开始施行。需倒装。句意:只有方案通过,才能实施。Can 提前即可。故选C。

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