中文谷Theconceptofmaglevtransportationwas
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問題詳情：
The concept of maglev transportation was ______first presented in the mid-20th century and the first commercial maglev train line was put into ______ operation at Birmingham Airport in Britain in ㊣1984
A. the; the B. the; / C. /; the D. /; /
【回答】
D
知識點：冠詞
題型：選擇題
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