Question

Since you are tired, you’d better＿＿＿and have a good rest.

Answer 1

C

非谓语动词的用法。stop to do sth指停下来去做（另一件事）；stop doing sth指停止正在做的事，根据句意“既然你累了，你最好停止学习，去好好休息一下。”选C。