单选题 Voices were ______ as the argument between the two motorists became more bad-tempered.
【正确答案】 D
【答案解析】本题考的是动词的上下文语义。A意为“肿胀’，B意为“增加”，C意为“发展”，D意为“提高”。根据题意，选项D为正确答案。