问题
选择题
—_______ to keep our classroom clean and tidy.
—You are right.[ ]
A. That's our duty
B. This is our duty
C. It's our duty
D. The duty is
答案
答案：C
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—_______ to keep our classroom clean and tidy.
—You are right.[ ]
A. That's our duty
B. This is our duty
C. It's our duty
D. The duty is
答案：C