能在无色溶液中大量共存的一组离子是

A．Cu²⁺、SO₄^2—、OH^—、K⁺

B．Fe³⁺、Cl^—、NO₃^—、H⁺

C．K⁺、CO₃^2—、Cl^—、H⁺

D．H⁺、Na⁺、Cl^—、SO₄^2—

—Have you ever been to Shanghai, Mary?

—Yes. I ______ there for three days with my parents last year.     [ ]

A .have gone      

B. have been    

C. went      

D. was