—I’m not sure when the 6th national population census(人口普查)completed?
—_______ November, 2010.
| A．On | B．In | C．At | D．Of |
—I’m not sure when the 6th national population census(人口普查)completed?
—_______ November, 2010.
| A．On | B．In | C．At | D．Of |
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