单选题 With one leg broken in that car accident, he cannot even walk, ______ run.

【正确答案】 A
【答案解析】句意:在车祸中,他的一条腿骨折,他连走路都不行,更不用说跑了。let alone意为“更不必说”;don't mention it意为“不用客气”;that is to say意为“也就是说”。