问题
选择题
My father was preparing for his speech __ my mother was doing some washing last night.
A．if
B．while
C．unless
D．until
答案
答案：B
考查时间状语从句。句意“昨晚我爸爸正在为演讲做准备，而妈妈正在洗衣服。”while表对比，前后都用进行时。故选B。
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