Kate often helps mother --------homework.1does 2did 3doing 4with
问题描述：
Kate often helps mother --------homework.1does 2did 3doing 4with
答
要做这道题,首先要明白是什么考点.
搭配如下：
help sb do sth
help sb with sth
如果是符合第一条的话,动词应该是原型.但是答案中没有正确的,所以排除
所以是符合第二个答案的,也就是第四个答案.