应该是C,其实有时候做题不要想得太复杂,这里考的就是tell sb (not) to do这个考点
当然tell确实可以接从句　　sb tell (that )/sb tell sb (that)
但你说的祈使句从句我貌似没有听说过,这里如果要用从句,我觉得应该这样说Father aften tells me (that)we shouldn't spend too much time on computer games.答案也是C，我选的也是C。但是老师说A语法没有问题，请挑刺。