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【单选题】
In many countries, an indigenous language is used for daily communication _____ another language is used for official business.
A.
while
B.
even though
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】_____ some governments officially protect native languages, their survival is not guaranteed.
A.
Although
B.
Yet
【单选题】The word algebra looks like a Latin or Greek word, _____ it comes from Arabic.
A.
yet
B.
however