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    精英家教网 > 高中英语 > 题目详情
    The drug used to treat this disease causes bad side effects, some of which ________ deadly.
    A．isB．are
    C．wasD．were
    B
    B 考察主谓一致。Some of which引导非限制性定语从句，在从句中做主语，修饰先行词bad side effects，故从句中使用复数形式，由此排除AC，由主句的时态和语境可知表示客观性，故使用一般现在时。故B正确。
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