三氟化硼乙醚络合物分子式是()
A. BF<sub>3</sub>O(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>
BF<sub>2</sub>CO(C<sub>2</sub>H<sub>6</sub>)<sub>2</sub>
C. BF<sub>3</sub>OH(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>
D. BF<sub>3</sub>O(C<sub>2</sub>H<sub>5</sub>)<sub>3</sub>