Every morning the pupils read the text ___in the classroom.A.on the top of their voices B.at the top of their voiceC.at the top of their voices D.on the top of their voice

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Every morning the pupils read the text ___in the classroom.A.on the top of their voices B.at the top of their voiceC.at the top of their voices D.on the top of their voice
Every morning the pupils read the text ___in the classroom.
A.on the top of their voices B.at the top of their voice
C.at the top of their voices D.on the top of their voice

Every morning the pupils read the text ___in the classroom.A.on the top of their voices B.at the top of their voiceC.at the top of their voices D.on the top of their voice
用ON~固定搭配~还有VOICE是不可数名词~所以用D~

b