—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

某板坯连铸机切割辊道间距为1.35m，则该之间切割的最短定尺为（）。

A.1.35m

B.2.50m

C.2.70m

D.3.0mm