It was not until the early 1950s ______m

问题选择题

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

答案

答案：C

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.