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