Question

【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

Answer 1

【答案】B

【解析】

句意：到目前為止，他們已經(jīng)學(xué)會(huì)了四種語言。有時(shí)它們混合在一起�？疾閯�(dòng)詞時(shí)態(tài)辨析題。So far到目前為止，用于現(xiàn)在完成時(shí)，即“have/has + done”結(jié)構(gòu)，they是復(fù)數(shù)人稱，助動(dòng)詞需用have；Sometimes有時(shí)，用于一般現(xiàn)在時(shí)，they是復(fù)數(shù)人稱，動(dòng)詞需用原形。根據(jù)句意結(jié)構(gòu)，可知選B。