单选题
That father cannot even discipline himself, ______ setting a good
example to his children.
A. let alone
B. much less
C. still less
D. not to mention
【正确答案】
D
【答案解析】四个选择项都有“更不用说”的意思，但在用法上，let alone，still less，much less有并列连词的意味，连接并列的词类或结构。如果此句用的是...set a good example...，那这三个任何一个都可以，而not to mention后接名词或动名词，因此应选D。