选择题!Mrs.Green is busy（）in the kitchen while her son is busy （）the_英语解答

选择题!Mrs.Green is busy（）in the kitchen while her son is busy （）the homework.
A.cooking；with
B.to cook；with
C.cooking；to do
D.with cooking；doing

人气：241 ℃　时间：2019-10-23 14:15:35

解答

a
be busy doing sth
be busy with sth