– Good afternoon Miss Gao. – A. Good.B. Good afternoon.C. Good morning.D. Hello.

问题补充：

– Good afternoon, Miss Gao. –

A. Good.

B. Good afternoon.

C. Good morning.

D. Hello.

答案：

A. Good.

(答案→)B. Good afternoon.

C. Good morning.

D. Hello.

解析：句意：下午好，高小姐。根据习惯该用Good afternoon.作应答。所以选B。