问题
选择题
I don't know who invented _____ telephone. It's really _____ most useful invention. [ ]
A. the; a
B. /; a
C. a; the
D. /; the
答案
答案：A
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I don't know who invented _____ telephone. It's really _____ most useful invention. [ ]
A. the; a
B. /; a
C. a; the
D. /; the
答案：A