My sister always ----- her homework at home.a.do b.does

问题描述:

My sister always ----- her homework at home.a.do b.does

B

b
动词用第三人称现在时

my sister always does`````
楼主记住she/he是第三人称
所以要用 does、
ps 除了情态动词 如 can may must等等
还有,to