I don’t know who invented telescope but I think it is most useful invention.A. the the

问题补充：

I don’t know who invented telescope, but I think it is most

useful invention.

A. the, the

B. the, a

C. a, the

D. a, a

答案：

A. the, the

(答案→)B. the, a

C. a, the

D. a, a

解析：考查冠词的用法。第一空：发明物的前面必须加the,第二空：泛指一项非常有用的发明，所以用不定冠词a，故选B。