—May I have a look at the MP4,sir
—Which one _____black one
A.A B.An C.The D.不填
本句中特指“这台黑色的”,所以用定冠词the.
—Have you seen ____pen I left it on my desk this morming?
—Is it ____ green pen It was taken by Mr.Wang.
A.a;the B.the;the C.the;a D.an;an
从句意可以看出,问话人以为对方知道那支钢笔,用定冠词；而答话者则询问是否是一只绿色的钢笔,因此用不定冠词.
这两道题出自同一本练习里面.我觉得好矛盾,都是什么“黑色的”“绿色的”,为什么一个用定冠词一个又用不定冠词?