As early as 1637 Ohio made a decision that free, tax supported schools must be established in every town ______ 40 households or more.
A、
having
B、
to have
C、
to have had
D、
having had
【正确答案】
A
【答案解析】
解析：根据句子结构，空格后的部分是修饰every town，作定语讲，应选择分词 having。
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