There is great pleasure in watching wildlife in natural or near-natural environments， and tourism can _____ the income of countries.<br>A. add to B. take to C. keep to D. see to

There is great pleasure in watching wildlife in natural or near-natural environments， and tourism can _____ the income of countries.
A. add to B. take to C. keep to D. see to

出自：湖南科技大学大学英语3

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