The first World Cities Day of the UN, _______on Oct.31, 2014 in Shanghai, focused on leading urban transformation.
A.to have been held | B.having held |
C.held | D.being held |
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The first World Cities Day of the UN, _______on Oct.31, 2014 in Shanghai, focused on leading urban transformation.
A.to have been held | B.having held |
C.held | D.being held |