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

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Whilehe----(wait)forthebus,he------(read)abook.Whilehe----(wait)forthebus,he------(read)abook.Whileh

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