It was in the mid-1980s that cartoons began to take off in China,there were only pictured-

发布时间：2020-08-17 12:41:55

It was in the mid-1980s that cartoons began to take off in China,    there were only pictured-story books.
A. when
B. after that
C. before which
D. where

网友回答

A. when
B. after that
(答案→)C. before which
D. where
解析：考查非限制性定语从句，先行词为the mid1980s，故选C项。
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