Do you often look out of the windows while you ______ lessons?

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问题 Do you often look out of the windows while you ______ lessons?

选项 A、have
B、had
C、are having
D、has

答案C

解析 本题考查动词的用法。while引导的从句用进行时,主句用—般时。该句意为:你上课时,是不是经常看窗外?
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