问题
选择题
Grace often helps her mother______ some housework. [ ]
A. did
B. do
C. does
D. doing
答案
答案：B
搜题请搜索小程序“爱下问搜题”
Grace often helps her mother______ some housework. [ ]
A. did
B. do
C. does
D. doing
答案：B
