Cathie didn't know(where could we buy the tickets/what was he waiting for)因该选哪个
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Cathiedidn'tknow(wherecouldwebuythetickets/whatwashewaitingfor)因该选哪个Cathiedidn'tknow(whereco
Cathie didn't know(where could we buy the tickets/what was he waiting for)因该选哪个
Cathie didn't know(where could we buy the tickets/what was he waiting for)因该选哪个
Cathie didn't know(where could we buy the tickets/what was he waiting for)因该选哪个
后面的 因为宾语从句要用陈述句语态哦!