第17题:谁是加拿大联邦官方反对党领袖？

The leader of the Official Opposition is the leader of the party with the second-most seats in the House of Commons. NOTE: this is a time-sensitive fact — please verify the current officeholder before the actual exam, as it may have changed.

官方反对党领袖是下议院第二大党的党魁。提示：这是随时间变化的时事类信息，考试前请核实当前实际人选是否已更新。