The plane flew smoothly in the sky and people spoke of theexperienced pilot. A. high；hig

问题补充：

The plane flew smoothly in the sky and people spoke of theexperienced pilot.

A. high；high

B. highly；highly

C. high；highly

D. highly；high

答案：

A. high；high

B. highly；highly

(答案→)C. high；highly

D. highly；high

解析：high in the sky 是个形容词短语，意为“高高地在天上”。同时，speak highly of 是个词组，表示“高度赞扬”的意思。