It was about 600 years ago the first clock with a face and an hour hand was made .Athat

发布时间：2020-08-17 13:17:10

It  was  about  600  years  ago     the  first  clock  with  a  face  and  an  hour  hand  was  made .   
Athat
B. until
C. before
D. when

网友回答

(答案→)A. that
B. until
C. before
D. when
解析：这是一个强调句，强调时间状语about  600  years  ago。
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