I _____ her talking about Mrs. Anderson whom I had never _____.
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All the workers in the factory _____ protective hats.
下列几种互联设备中， (60) 是网络层互联设备。
A. 网桥
B. 交换机
C. 路由器
D. 网关
任意一个有向图的拓扑序列 (33) 。
A. 可能不存在
B. 有一个
C. 一定有多个
D. 有一个或多个
The true reason who Jane went finishing is as _____ as glass-she didn’t want to have to clean the house.
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