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【题目】So far they to speak four languages. Sometimes they them.

A. have learned; have mixed B. have learned; mix C. learned; mix D. learned; mixed

【答案】B

【解析】

句意:到目前为止,他们已经学会了四种语言。有时它们混合在一起。考查动词时态辨析题。So far到目前为止,用于现在完成时,即“have/has + done”结构,they是复数人称,助动词需用have;Sometimes有时,用于一般现在时,they是复数人称,动词需用原形。根据句意结构,可知选B。

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