单选题
Michael: Hi, mom. I'd like you to meet my girlfriend, Susan Lee. Susan, this is my mother.Susan: How do you do, Mrs. Miller.Mother: How do you do, Susan. I'm glad you can join us. ______.
【正确答案】
C
【答案解析】[注释] 主人让客人“随意一些”的说法是Make yourself at home．而A．Take it easy．表示“别着急，别过于努力”；B，D的搭配不符合习惯用法。