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，前后都用進行時。故選B。
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