- Mr Smith gave a talk at No. 1 Middle School last week. - Do you know ? A. what did he talk about B. what he talked about C. which he talks about 【查看更多】

 

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— Mr Smith gave a talk at No. 1 Middle School last week. 
— Do you know ______?
[     ]
A. what did he talk about
B. what he talked about
C. which he talks about

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