While he ----(wait) for the bus,he ------(read) a book.

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While he ----(wait) for the bus,he ------(read) a book.
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While he ----(wait) for the bus,he ------(read) a book.
While he ----(wait) for the bus,he ------(read) a book.

While he ----(wait) for the bus,he ------(read) a book.
While he（ was waiting） for the bus,he（ was reading） a book.

was waiting,was reading
while引导的时间状语从句，当两个动作都是延续性动词时如本题的wait和read时，主句和从句都用进行时态。
祝你进步！

was waiting,was reading

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