单项选择题

Could you tell me how old______to buy beer?
A．a person has to be
B．has a person
C．has to be person
D．a person be

A.a
B.has
C.has
D.a

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天南星除燥湿化痰外，又能查看材料

A.消食化滞
B.理气调中
C.降逆止呕
D.发表散寒
E.祛风止痉

单项选择题

I was not aware of how deeply______the death of his mother.
A．he had felt
B．had he felt
C．did he felt
D．he feels

A.
A．he
B.had
C.did
D.he