问题
选择题
Look. This is _____ clock. It's _____ alarm clock.[ ]
A. a; an
B. an; an 
C. an; a
D. a; a
答案
答案：A
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Look. This is _____ clock. It's _____ alarm clock.[ ]
A. a; an
B. an; an
C. an; a
D. a; a
答案：A