It was not until the early 1950s most tape recorders began using plastic tape as they do today.A．whenB．whichC．thatD．Before 题目和参考答案——青夏教育精英家教网—

题目内容

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

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