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题目内容
（国家开放大学-开放英语4）
It’s one of the coolest springs we_________________.
选择一项：
a.
ever know
b.
ever knew
c.
have ever known
d.
are knowing
选择一项：
a.
ever know
b.
ever knew
c.
have ever known
d.
are knowing
参考答案
