单选题 Packed like sardines into sweaty, claustrophobic subway carriages, passengers can barely breathe, ______ move about freely.
A. as well as B. disregard for C. let alone D. not mentioning

【正确答案】 C

【答案解析】[解析] 句意是：挤得像沙丁鱼一样，汗流浃背的乘客在幽闭的地铁车厢里几乎无法呼吸，更不用说自由移动了。as well as“和，同，既……又”；disregard for“忽视，轻视”；let alone“更不用说”；not mentioning“没有提及”。因此本题选C。