【题目】The radio set _____ last week has been out of order.
A.I boughtB.I bought itC.which I bought itD.what I bought
在线课程【答案】A
【解析】
考查定语从句。句意：我上周买的那台收音机坏了。分析句子可知，空格处是定语从句，修饰The radio set，先行词指物，在定语从句中宾语，当定语从句修饰的名词在从句里作宾语的时候，往往会省略关系代词；B、C项it多余，D项中what不引导定语从句。故选A。