问题描述：
-we need to make different kinds of food.-my father is a good cook.he__help us.
A.can
B.is able to
C.may
D.will
为什么能选A,却不能选B?
A.can
B.is able to
C.may
D.will
为什么能选A,却不能选B?
问题解答：
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