The drug used to treat this disease causes bad side effects, some of which deadly.A．is B．areC．was D．were 题目和参考答案——青夏教育精英家教网—

题目内容

The drug used to treat this disease causes bad side effects, some of which ________ deadly.

A．is B．are

C．was D．were

【解析】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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