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The project alongside with the experiment we had once devoted so much time ______ perfectly.
A.to work outB.to working out
C.to worked out D.has worked out
C

试题分析:本题中含有一个定语从句we had once devoted so much time to,这个定语从句修饰先行词the experiment,定语从句中有一个固定搭配devote some time to…花时间在…之上;横线首先要填to,然后再接谓语动词work out。另外定语从句中使用了过去完成时had devoted,说明后面主句使用的是过去的时态。句义:这项工程和我们已经花了很多时间做的实验结果非常完美。故C正确。
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