The doctor telephoned to say that he couldn’t the meeting because he had to a patient.A.

问题补充：

The doctor telephoned to say that he couldn’t the meeting because he had to a patient.

A. came to; attend to

B. attend; attend

C. join; treat

D. attend on; look after

答案：

A. came to; attend to

(答案→)B. attend; attend

C. join; treat

D. attend on; look after

解析：参加会议常用attend/ be present at the meeting，照看病人用attend（on）a patient/ look after a patient。