There were lots of activities you could to take up (去掉TO ）为什么

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There were lots of activities you could to take up (去掉TO ）为什么

去掉to 是因为前面有情态动词could.情态动词后接动原.

情态动词后面紧跟动词原型

could 是情态动词、后直接跟动词原形、不用加to 、