1.You should be more careful __ your study.A.of B.for C.over D.on
问题描述：
1.You should be more careful __ your study.A.of B.for C.over D.on
答
选a吧。be careful of是短语，表对什么小心或留意
答
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.