The U. S. population of kids (grow)______since the 1970s, and will remain at hig

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问题 The U. S. population of kids (grow)______since the 1970s, and will remain at high levels through the 1990s.

选项

答案 has been growing

解析根据句意，空格处应填写一个谓语动词，应该使用现在完成进行时。

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