—Hey, who’s that man over there? He    us since we came in.

—The one by the door? I don’t know. He looks like a lawyer or something, not a journalist. Perhaps he      here to look round, like us.

A．has watched；only came

B．is watching；had only come

C．has been watching；has only come

D．had been watching；came

水源来水进站经计量后，进入（）。

A、注水泵

B、储水罐

C、水池

D、注水管网