问题描述：
一道语法题 in the first three months that giant pandas
一道语法题
in the first three months that giant pandas were on public display,visits to the zoo ( )by as much as 50 percent
为什么是 increased而不是have increased
一道语法题
in the first three months that giant pandas were on public display,visits to the zoo ( )by as much as 50 percent
为什么是 increased而不是have increased
问题解答：
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