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【題目】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：到目前為止，他們已經學會了四種語言。有時它們混合在一起�？疾閯釉~時態(tài)辨析題。So far到目前為止，用于現(xiàn)在完成時，即“have/has + done”結構，they是復數(shù)人稱，助動詞需用have；Sometimes有時，用于一般現(xiàn)在時，they是復數(shù)人稱，動詞需用原形。根據(jù)句意結構，可知選B。

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