问题
选择题
It's ______ black. It's ______ black ruler. [ ]
A. a; /
B. /; a
C. a; a
D. /; /
答案
答案：B
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It's ______ black. It's ______ black ruler. [ ]
A. a; /
B. /; a
C. a; a
D. /; /
答案：B