Take 60mg up to four times a day, ______ advised otherwise by a doctor.A、ifB、un

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问题 Take 60mg up to four times a day, ______ advised otherwise by a doctor.

选项 A、if
B、until
C、though
D、unless

答案 D

解析本题测试连词的用法。If“如果”；until“直到”；though“虽然，尽管”；unless“除非”。根据题意，故答案为D。

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Take60mguptofourtimesaday,______advisedotherwisebyadoctor.A、ifB、un