题目内容

We had         exam yesterday. I spent          hour on it.

A. a; a                          
B. a; an                    
C. an; a                        
D. an; an

试题答案

D
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We had         exam yesterday. I spent          hour on it.
[     ]
A . a;a                          
B. a;an                    
C. an;a                        
D. an;an
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