请选择ABCD-B/o.^0@4I4J.K6m8Q May I speak to Mr. Smith, please?9o/g1^6{8~
--___________, please. I call him for you.9o/g1^6{8~
A. hold back9o/g1^6{8~
B. hold on9o/g1^6{8~
C. hang up9o/g1^6{8~
D. speak9o/g1^6{8~