It was not until 1920 regular radio broadcasts began. A.while b.which C.that D.since——青夏教育精英家教网—

摘要：It was not until 1920 regular radio broadcasts began. A.while b.which C.that D.since

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It was not until 1920 _______ regular radio broadcasts began.

A. while　　B. which　　 C. that　　　D. when

It was not until 1920 ________ regular radio broadcasts began.

A. while　 B. which　 C. that　　 D. since

It was not until 1920 ______ regular radio broadcasts began.

A. while　　　 B. which　　　　 C. that　　　　 D. since　　　　

It was not until 1920________ regular radio broadcasts began.

A. while　　　　　　　　　　 B. which　　　　　　　　　　 C. that　　　　　　　　　　 D. since

A. while　　　　　　　　　　 B. which　　　　　　　　　　 C. that　　　　　　　　　　 D. since

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