Pieces of bamboo or wood books between 2nd and 5th century AD.A. used to formedB. used to

发布时间：2020-08-17 03:39:42

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 beforming

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解析：句意：竹片或木片被用来制成书在公元2-5世纪。这里是短语be used to do被用来;used to do过去常常;根据句意故选C。
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