问题描述：
is li ming in the classroom?yes,i noticed him___(go) into it just now.
i'll go to the library as soon as i finish what i __
A.have done
B.was doing
C.had done
D.am doing求答案和解释
is li ming in the classroom?yes,i noticed him___(go) into it just now.这也是一题，
i'll go to the library as soon as i finish what i __
A.have done
B.was doing
C.had done
D.am doing求答案和解释
is li ming in the classroom?yes,i noticed him___(go) into it just now.这也是一题，
问题解答：
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