He used to in the sun but now he is used to at night.A. read; readB. reading; readC. read

问题补充：

He used to in the sun, but now he is used to at night.

A. read; read

B. reading; read

C. read; reading

D. reading, reading

答案：

A. read; read

B. reading; read

(答案→)C. read; reading

D. reading, reading

解析：be used to sth习惯于某事;used to do sth过去常常做某事.句意:他过去常常在太阳底下读书，但是他现在习惯了在晚上读书。故选C。