题目内容
4．Premier Li promised to punish the criminals ________ sold the illegal vaccines（非法疫苗）．（ ）| A． | which | B． | who | C． | whom | D． | whose |
分析 李总理承诺对那些售卖非法疫苗的罪犯实施惩罚．
解答 答案：B；
首先分析句子结构，本句中的"________ sold the illegal vaccines"在复合句中作定语从句，由于先行词 criminals为下文定语从句的逻辑主语，且指人，所以引导定语从句的关系代词用that或者who，故选B．
点评 本题考查定语从句的关系代词．做此题的关键是找准先行词，是人还是物，在从句中做什么句子成分，然后根据语法选择正确的引导词．
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