单选题 They usually have less money at the end of the month than ______ at the beginning.
A. which is B. which was C. they do D. it is

【正确答案】 C

【答案解析】[解析] 综观全句我们可以看出than后面引导的是一个比较状语从句，作为than前面部分的比较对象；又因为比较的两个部分结构应该相同，因此A项、B项和D项皆不正确。本句中的比较状语从句有所省略，完整的句子应是“than they have money at the beginning of the month”。由此可见，C项为正确答案。