问题
选择题
I don't know _____or not.[ ]
A. whether he is at home
B. if he is at home
C. that he is at home
D. whether is he at hom
答案
答案：A
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I don't know _____or not.[ ]
A. whether he is at home
B. if he is at home
C. that he is at home
D. whether is he at hom
答案：A