2. 外语
  3. The U.S. population of kids (grow)______since the 70s, and will remain at high levels through the’ 90s.

The U.S. population of kids (grow)______since the 70s, and will remain at high levels through the’ 90s.

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问题 The U.S. population of kids (grow)______since the 70s, and will remain at high levels through the’ 90s.
选项
答案has been growing
解析 句意：70年代以来美国的小孩人口一直在增长，90年代仍然保持高水平。该题考查的是时态。根据句意作谓语，用完成进行时。
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