问题
选择题
It used to be (过去是) _______ telephone, but now it's _______. [ ]
A. her; mine
B. hers; my
C. hers; mine
答案
答案：A
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It used to be (过去是) _______ telephone, but now it's _______. [ ]
A. her; mine
B. hers; my
C. hers; mine
答案：A
（各物理量均采用国际单位制单位），则该质点（）