Every morning the pupils read the texts in the classroom.
A. on the top of their voices
B. on the top of their voice
C. at the top of their voices
D. at the top of their voice
网友回答
A. on the top of their voices
B. on the top of their voice
(答案→)C. at the top of their voices
D. at the top of their voice
解析：可联系答.案.网客服索取。