第9题: [单项选择]The relationship between employers and employees has been studied______. A. originally B. extremely C. violently D. intensively 参考答案:D 答案解析:D项 intensively “深入地,加强地”符合题意。其他三项中,A项 originally 意为“最初地,原始地,有独创性地”,B项 extremely 意为“极度地”,C项 violently