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Principal: Someone must have been in my room. 

Teacher: _____ you are so sure of that? 

Principal: There's the smell of cigarette smoke here. 


(A) How about 


(B) How come 


(C) What exactly 


(D) What if 

編輯私有筆記
答案:B
難度:簡單
1F
DD 大二上 (2012/06/05 12:36)
How come  為什麼