单项选择题
M: Hello, this is John Hopkins at the Riverside Health Center. I’d like to speak to Mr. Jones.
W: I’m sorry, Mr. Hopkins, my husband isn’t at home. But I can give you his office phone number. He won’t be back until 6 o’clock.
A. At home.
C. At the health center.
B. At the riverside.
D. At his office.