题目内容：

1.--- Have you seen ____ knife?I left it here this morning.
--- Is it ____ white one?I think I saw it somewhere.
A.a; the B.the; the C.the; a D.a; a
我选择的是A,

优质解答

因为后面说了,I left it here.我是明确知道是哪把刀的,所以第一空是填定冠词the,特指那边我放在那儿的刀子.而第二空,说话人不能确定那把就是要找的刀,只能确定是白色的,所以他只能说,是一把白色的刀吗?用不定冠词a ,表示一个.