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I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

A．1ook at．    B．1ook into    C．1ook after    D．1ook out

I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

A．1ook at．    B．1ook into    C．1ook after    D．1ook out

I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

A．1ook at．    B．1ook into    C．1ook after    D．1ook out