问题
选择题
umbrella is useful object for people, especially on rainy days. [ ]
A. An; a
B. A; a
C. The; an
D. A; an
答案
答案：A
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umbrella is useful object for people, especially on rainy days. [ ]
A. An; a
B. A; a
C. The; an
D. A; an
答案：A