boys and girls dress warmly,for it( )be quite cold here at night A must B need C can D should答案选了C我想知道为什么D不行,

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boysandgirlsdresswarmly,forit()bequitecoldhereatnightAmustBneedCcanDshould答案选了C我想知道为什么D不行,boysandgir

boys and girls dress warmly,for it( )be quite cold here at night A must B need C can D should答案选了C我想知道为什么D不行,
boys and girls dress warmly,for it( )be quite cold here at night A must B need C can D should
答案选了C我想知道为什么D不行,

boys and girls dress warmly,for it( )be quite cold here at night A must B need C can D should答案选了C我想知道为什么D不行,
Can 表示一种客观的,理论的可能性“有时候会”
should 表示应该,强调的是责任和义务