It is generally thought to be of necessity to a college student that he _______ (know) at least one foreign language.

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问题 It is generally thought to be of necessity to a college student that he _______ (know) at least one foreign language.

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答案know

解析 —看见“It is generally thought to be of necessity to a college student that...”结构从necessity上就应反映出用虚拟语气。
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