--Thedoctor’sdiscoveryhashad

问题详情：

 -- The doctor’s discovery has had __ profound effect on mankind.

-- So it has. It has made __ great difference to our life span.

A. the; a   B. the; the   C. a; a   D. a; the

【回答】

C

知识点：冠词

题型：选择题