Canada is one of largest countries in the world second only to Russia.A. the; theB. the; a

问题补充：

Canada is one of largest countries in the world,second only to Russia.

A. the; the

B. the; a

C. a; the

D. the;/

答案：

A. the; the

B. the; a

C. a; the

(答案→)D. the;/

解析：句意:加拿大是世界上最大的国家之一，仅次于俄罗斯。表示形容词最高级的前面用定冠词the；second是副词，前面不用冠词。故选D。

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