问题补充:
----Have you seen____pen﹖I left it here this morning.
-----Is it____black one﹖I think I saw it somewhere.
A. a;the
B. the;the
C. the;a
D. a;a
答案:
A. a;the
B. the;the
C. the;a
(答案→)D. a;a
解析:第一空表泛指,pen为可数名词,故用a,第二空也表泛指,故选D。句意,——你看见了一支笔吗?今天早晨我落在这了。——是一支黑色的吗?我好像在哪看见了。