题目内容
Pieces of bamboo or wood ____ books between 2nd and 5th century AD.
A. used to formed B. used to form
C. were used to form
D. used to be forming
C
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题目内容
Pieces of bamboo or wood ____ books between 2nd and 5th century AD.
A. used to formed B. used to form
C. were used to form
D. used to be forming
C