It was not until the early 1950s most tape recorders began using plastic tape as they do t

发布时间：2020-08-16 21:00:08

It was not until the early 1950s     most tape recorders began using plastic tape as they do today.
A. when
B. which
C. that
D. Before

网友回答

A. when
B. which
(答案→)C. that
D. Before
解析：考查强调句的用法。根据句子结构可知，此句为强调句，强调not until the early 1950s, 完整的句子结构为Most tape recorders didn't begin using plastic tape as they do today until the early 1950s.
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