一Did you notice __________________ in his office？
一Yes，he was going over our homework.
A．how Mr.Li was doingB．what is Mr.Li doing
C．what Mr.Li was doing
一Did you notice __________________ in his office？
一Yes，he was going over our homework.
A．how Mr.Li was doingB．what is Mr.Li doing
C．what Mr.Li was doing
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