When he is awake he always keeps his eyes on the ceiling.A. fixB. fixingC. fixedD. to fix

问题补充：

When he is awake, he always keeps his eyes on the ceiling.

A. fix

B. fixing

C. fixed

D. to fix

答案：

A. fix

B. fixing

(答案→)C. fixed

D. to fix

解析：句意：当他醒着时，他总是保持眼睛注视着天花板。“keep +宾语+宾补”。宾语可以是名词或代词，宾补可以是形容词，介词短语或者分词，“他的眼睛”和“固定”之间是被动关系，故用过去分词，选C。