问题描述：
7.---Sorry ,Sir ,I can't answer the question.
---Well ,you are supposed ____ this part of history.(C)
A.reading
B.to be reading
C.to have read
D.having read
8.The stranger said something in a ____ voice and the little girl was very much ____ .(A)
A.frightening ; frightened
B.frightened ; frightening
C.frightening ; frightening
D.frightened ; frightened
---Well ,you are supposed ____ this part of history.(C)
A.reading
B.to be reading
C.to have read
D.having read
8.The stranger said something in a ____ voice and the little girl was very much ____ .(A)
A.frightening ; frightened
B.frightened ; frightening
C.frightening ; frightening
D.frightened ; frightened
问题解答：
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