Do you often look out of the windows while you ______ lessons?A、haveB、hadC、are

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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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