The plane flew smoothly in the sky and people spoke of the experienced pilot.
A. high；high
B. highly；highly
C. high；highly
D. highly；high
网友回答
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。