题目内容

It was not until the early 1950s ______most tape recorders began using plastic tape as they do today.
A.whenB.whichC.thatD.Before
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.
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