问题
选择题
—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
答案
答案：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。