指挥城市是与相结合的产物（）。
A、数字乡村物联网
B、数字城市互联网
C、数字城市物联网
D、数字乡村局域网
参考答案：C
This is our school. way, please. [ ]
A. The
B. Walk
C. This
They seemed ______ each other for a long time.
A．knowing
B．to know
C．having known
D．to have known
