______otherwise directed by a doctor, this medicine should be taken three times a day.

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问题 ______otherwise directed by a doctor, this medicine should be taken three times a day.

选项 A、Even if
B、Unless
C、Except that
D、As

答案B

解析 otherwise,副词,意为:“另外,别的样的”,按照句意,应选unless“除非”。句意为:除非医生有别的指示,否则这药应一天吃三次。
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