问题
选择题
Textbooks for junior students ______ for free in most areas of China.
A. provide B. provided C. are provided
答案
C
句意：教科书在中国大多数地区免费提供给中学生。所以要用被动语态。
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Textbooks for junior students ______ for free in most areas of China.
A. provide B. provided C. are provided
C
句意：教科书在中国大多数地区免费提供给中学生。所以要用被动语态。