问题
选择题
— 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
答案
答案：B
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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
答案：B