The U.S.population of kids (grow)__since the 1970s,

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The U.S.population of kids (grow)__since the 1970s,
The U.S.population of kids (grow) __________ since the 1970s,and will remain at high levels through the 1990s.
知道是has been growing,但是不理解为什么。

has been growing
再问：为什么？
再答：现在完成进行时 have been doing sth. + since +某个时间点

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