OnSundayshesometimes______hisclothesandsometimes______someshopping.A.Wash;do.B.iswashing;isdoing.C.Washes;do.D.Washes;does.为什么sunday后面有s?and前面和后面的动词需要保持一致吗?还是不管前面的动词是什么形态的,后面的动词要保持原型?