—_______ 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 |
—_______ 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 |
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