Mr.Wang made up his mind to devote all he could ___ his oral

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Mr.Wang made up his mind to devote all he could ___ his oral English before going abroad.
A.improve
B.to improve
C.improving
D.to improving

选D.
此题包含固定短语devote to,to是介词,后面应接动名词,all是先行词,后面包含了一个定语从句.
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