摘要：22．On October 1st, 2009, a grand ceremony was held the 60th anniversary of the founding of the People’s Republic of China． A．celebrating B．to celebrate C．to have celebrated D．having celebrated
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On October 1st, 2009, a grand ceremony was held _______ the 60th anniversary of the founding of the People’s Republic of China．
A．celebrating B．to celebrate C．to have celebrated D．having celebrated
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