This store is the largest __________ in this city.
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He had a ____________ that one day all slaves would be free.
We will ___________ for excellence in our service.
Quality is our best ____________ to our customers.
INT 21H功能调用中1号子功能可以得到一个键盘上的字符，将其ASCII码存入到寄存器中。
AL
BL
CL
DL
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