Question

—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

Answer 1

C

 本题考查时态。since后接从句,谓语动词用一般过去时,主句动词用现在完成时或现在完成进行时。第二个空是描述的预先在有关的境况，故不用一般过去时。