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        1. My father was preparing for his speech __ my mother was doing some washing last night.
          A.ifB.whileC.unlessD.until
          B
          考查時間狀語從句。句意“昨晚我爸爸正在為演講做準(zhǔn)備,而媽媽正在洗衣服。”while表對比,前后都用進(jìn)行時。故選B。
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