You must be very ()when you cross the busy street.A)care .B)careful .B) carefully随便说明为什么.

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You must be very ()when you cross the busy street.A)care .B)careful .B) carefully
随便说明为什么.

B)careful --------小心的,仔细的,谨慎的

B
A名词 B形容词 C 副词,

carefully因为VERY 后加形容词

careful
这是系表结构, 表语要用形容词

B 这空应填形容词…A为动词名词…B为形容词…C为副词