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已知,如图,AD与BC相交于点O,AB∥CD,如果∠B=20°,∠D=400,那么∠BOD为 ( )
A.40° B.50° C.60° D.70°
已知,如图,AD与BC相交于点O,AB∥CD,如果∠B=20°,∠D=40°,那么∠BOD为( )
A.40° B.50° C.60° D.70°