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 --Thedoctor’sdiscoveryhashad

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问题详情:

 --Thedoctor’sdiscoveryhashad

 -- 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