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He devoted all the time _____ his research .
A.to doB.doingC.to doingD.did
C

试题分析:考查词组:devote all the time to doing,致力于做…,句意:他所有时间都致力于他的研究。选C。
点评:英语中有的词组的to是介词后面要接动名词做宾语,如:be used to doing,look forward to doing等,不要和不定式混用。
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