问题
选择题
— What do you call this in English?
— It's a stamp. It ________ sending letters. [ ]
A. was used to
B. is used as
C. is used for
答案
答案：C
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— What do you call this in English?
— It's a stamp. It ________ sending letters. [ ]
A. was used to
B. is used as
C. is used for
答案：C