一I often see the sign in schools.What does it mean？
一Students bring mobile phones to school.（ ）
A．needn'tB．can'tC．couldn'tD．wouldn't
一I often see the sign in schools.What does it mean？
一Students bring mobile phones to school.（ ）
A．needn'tB．can'tC．couldn'tD．wouldn't
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