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They ___________to put their hearts into study..
A．have made their mindsB．have made their mind
C．have made up their mindsD．have made up their mind
C

試題分析：考查短語(yǔ)固定搭配。本題考查短語(yǔ)固定搭配make up one’s mind下定決心做某事。mind的數(shù)隨物主代詞的數(shù)而變化。句意：他們已經(jīng)下定決心投身于學(xué)習(xí)中。故C正確。
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