1.You should be more careful __ your study.A.of B.for C.over D.on

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1.Youshouldbemorecareful__yourstudy.A.ofB.forC.overD.on1.Youshouldbemorecareful__yourstudy.A.ofB.for

1.You should be more careful __ your study.A.of B.for C.over D.on
1.You should be more careful __ your study.A.of B.for C.over D.on  

1.You should be more careful __ your study.A.of B.for C.over D.on
careful for
你应该更留心你的学习.
careful 这里是形容词,留意,谨慎,小心.for...是介词短语作careful的补语,表目的.

选a吧。be careful of是短语,表对什么小心或留意