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问题: 求救,一道英语单选

What disappoints his parents is that the boy has got into ____habit in ____public.
A.a:a B,a:the C.不填;不填 D.the ; 不填

解答:

选D,get into the habit of doing something, 养成。。。的习惯, in public
是指在公共场合 ,而the public 是指公众。