Question

【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

Answer 1

【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。