问题
选择题
You must cut up _____ onion and _____ tomato first.[ ]
A. a; an
B. an; the
C. an; a
D. an; an
答案
答案：C
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You must cut up _____ onion and _____ tomato first.[ ]
A. a; an
B. an; the
C. an; a
D. an; an
答案：C