问题
选择题
This _____ your pen. It _____ my pen. [ ]
A．are; is
B．is; isn't
C．are; isn't
D．aren't; is
答案
答案：B
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This _____ your pen. It _____ my pen. [ ]
A．are; is
B．is; isn't
C．are; isn't
D．aren't; is
答案：B