问题补充:
He devoted all the time his research .
A. to do
B. doing
C. to doing
D. did
答案:
A. to do
B. doing
(答案→)C. to doing
D. did
解析: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。
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