—What’s most useful invention in the 20th century? — computer I think. A. the A B. a A

问题补充：

—What’s most useful invention in the 20th century?

— computer, I think.

A. the, A

B. a, A

C. the, The

D. /, The

答案：

A. the, A

B. a, A

(答案→)C. the, The

D. /, The

解析：形容词最高级前通常用the，所以第一个空选the，第二个空表示特别所指，也应

该选the，故选C。