It was not until 1920      regular radio broadcast began.
A．whileB．whichC．thatD．since
C
眾所周知，當(dāng)時(shí)間狀語(yǔ)由until/till引出時(shí)，如果謂語(yǔ)動(dòng)詞為非延續(xù)性動(dòng)詞，則要用否定式，表示“直到……才……”。本句的正常結(jié)構(gòu)應(yīng)為：Regular radio broadcast didn’t begin until 1920.如果強(qiáng)調(diào)本句的時(shí)間狀語(yǔ)，則要把not和until...一起放在句首，可以構(gòu)成：Not until 1920 did regular radio broadcast begin.（注意表示否定意義的副詞位于句首，要倒裝），如果使用強(qiáng)調(diào)結(jié)構(gòu)，則可構(gòu)成：It was not until 1920 that regular radio broadcast began.
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