Blacks held demonstrations to ________．A.make their voices heardB.let their voice heardC.make their voice hearingD.let their voices hear
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A解析voice用作“(表达出的)意见、愿望、呼声”时为可数名词，heard与voice之间存在被动关系．make one's voice heard意为“使自己的呼声被人听到”。let后不能接过去分词作宾语补足语，故B项错误。