While as workers or objects of affection, dogs have certainly proven themselves to be beneficial to humans in many ways.

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问题 While as workers or objects of affection, dogs have certainly proven themselves to be beneficial to humans in many ways.

选项 A、But
B、Whether
C、Lest
D、Though

答案B

解析 whether…or…固定搭配，意为“不论……还是……”。

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