单选题 The legal firm's services are relatively inexpensive compared to ______ offered by some of the larger firms.
A. which
B. who
C. that
D. those

【正确答案】 D
【答案解析】空格处词语是介词to的宾语，受到以offered为起始的分词短语修饰。从内容来看，必须填入代替前面出现的services的词语。因此正确答案是(D)选项those。