sat 改错题 recent medical breakthrough,including the discovery of a vaccine to show the AIDS virus,have encouraged researchers;and a cure is still eluding them.答案为分号后的and 错误 why?是不是分号后不能有and这种连接词?

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sat 改错题 recent medical breakthrough,including the discovery of a vaccine to show the AIDS virus,have encouraged researchers;and a cure is still eluding them.答案为分号后的and 错误 why?是不是分号后不能有and这种连接词?

sat 改错题 recent medical breakthrough,including the discovery of a vaccine to show the AIDS virus,have encouraged researchers;and a cure is still eluding them.答案为分号后的and 错误 why?是不是分号后不能有and这种连接词?
sat 改错题
recent medical breakthrough,including the discovery of a vaccine to show the AIDS virus,have encouraged researchers;and a cure is still eluding them.
答案为分号后的and 错误 why?是不是分号后不能有and这种连接词?

sat 改错题 recent medical breakthrough,including the discovery of a vaccine to show the AIDS virus,have encouraged researchers;and a cure is still eluding them.答案为分号后的and 错误 why?是不是分号后不能有and这种连接词?
句意：最近的医学突破,包括发现艾滋病毒的疫苗,大大鼓舞了研究人员,但是他们还是没有找到治愈的方法.
根据上下文逻辑,and应该改成but.

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