【单选题】— Have you seen Mr. Smith? — He arrived ______ you were asleep. [ ]
【单选题】Have you seen Mr. Li ________?
【单选题】—Have you seen Mr. Smith? —Yes. Look, he _________with a parent in the office.
【单选题】在数据链路层实现网络的连接可以采用( )设备。
【单选题】—Have you seen Mr. Smith? —Yes. Look, he _______ his bike over there. [ ]
【单选题】— Have you seen Mr. Smith? — Yes. Look, he ____ his car over there. [ ]