are
学习是一件愉快的事! (*^__^*)
请及时采纳,多谢!如果句子改为: The most important characteristics a good teacher must have___patient.请问用is还是are？不能这样改，因为前面characteristics是复数，后面只有“耐心”一个特点，前后矛盾。那如果是这样对吗：The most important characteristic a good teacher must have_is__patient.正确。thank you very much那么，嘿嘿，请采纳。