This year President Xi Jinping wrote a letter to the young pioneers China to celebrate ________ 70th anniversary（周年纪念日）． （ ）
A．theirB．themC．theirsD．they
This year President Xi Jinping wrote a letter to the young pioneers China to celebrate ________ 70th anniversary（周年纪念日）． （ ）
A．theirB．themC．theirsD．they
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