用适当的短语完成句子. The US is their research on outer space．题目和参考答案——青夏教育精英家教网—

题目内容

用适当的短语完成句子。

The US is ________ their research on outer space．(step up/step forward)

答案：put on
解析：

此处要表示“逐步提高；加速；增加”。

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