问题
选择题
—What's this?
—_________. [ ]
A. This is a pen.
B. That's a pen.
C. It's a pen.
D. They are pens.
答案
答案：C
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—What's this?
—_________. [ ]
A. This is a pen.
B. That's a pen.
C. It's a pen.
D. They are pens.
答案：C