题目内容
Pieces of bamboo or wood ________ books between the 2nd and 5th centuries A.D.
A.used to be formed
B.used to form
C.were used to forming
D.used to be forming
答案:A
提示:
提示:
used to do过去常常,be used to doing习惯于;该句应为被动语态。
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