语法与词汇 The trade union leaders had been urged to make a (concession) by the protesters.
【正确答案】 D
【答案解析】compromise“妥协、让步”，与concession同义。apology“道歉”；permission“许可、允许”；substitution“代替，替换”。本题译文：抗议者要求工会领导做出让步。