【单选题】Last week the writer went to the theatre . He was the theatre.
【单选题】Last week the writer went to the theatre. He was ______ the theatre.
【单选题】Last week the writer went to the theatre. Ha was ____the theatre.
【单选题】Last week the writer went to the theatre. He was ______ the theatre.
【判断题】在数据链路层中,帧是数据链路层的传送单位。( )