Betty shows great interest in this poet now, but she thought it boring ________ she read it．A.at the first timeB.the first timeC.for the first timeD.at first
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B解析考查介词/连词。…she read it是一个完整的句子，不能使用介词短语引导，A、C、D都是介词短语，而the first time可作连词用，引导一个时间状语从句。