问题
选择题
This is _____ arm and it isn't _____ leg. [ ]
A. a; a
B. an; an
C. an; a
D. the; a
答案
答案：C
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This is _____ arm and it isn't _____ leg. [ ]
A. a; a
B. an; an
C. an; a
D. the; a
答案：C