It was not until 1920 regular radio broadcasts began. A. when B. which C. that ——青夏教育精英家教网—

摘要： It was not until 1920 regular radio broadcasts began. A. when B. which C. that D. since 独立主格: 独立主格要认清.名代之后形或副.不定式.分词和介短.位置结构要记牢.名代二词是其主.千变万化做状语第八课时

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It was not until 1920 ___ regular radio broadcasts began.

A. when 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

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It was not until 1920 regular radio broadcasts began.

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

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It was not until 1920 ________ regular radio broadcasts began．

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