— Will you be this afternoon, John?
— I am afraid not. I have an appointment with my dentist.
A. convenient
B. suitable
C. accurate
D. available
网友回答
A. convenient
B. suitable
C. accurate
(答案→)D. available
解析：A.方便的 B.合适的 C.准确的 D.有空的，可利用的 句意：—你下午有空吗，约翰？—我恐怕没有，我约了去看牙医。故选D