The project alongside with the experiment we had once devoted so much time ______ perfectly.

A．to work out B．to working out  
C．to worked out  D．has worked out 

C

解析試題分析：本題中含有一個(gè)定語從句we had once devoted so much time to，這個(gè)定語從句修飾先行詞the experiment，定語從句中有一個(gè)固定搭配devote some time to…花時(shí)間在…之上；橫線首先要填to，然后再接謂語動(dòng)詞work out。另外定語從句中使用了過去完成時(shí)had devoted，說明后面主句使用的是過去的時(shí)態(tài)。句義：這項(xiàng)工程和我們已經(jīng)花了很多時(shí)間做的實(shí)驗(yàn)結(jié)果非常完美。故C正確。
考點(diǎn)：考察句子結(jié)構(gòu)和時(shí)態(tài)

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