一道英语选择题,every year a flood of farmers arrive in
问题描述：
一道英语选择题,every year a flood of farmers arrive in
shenzhen for the money-making jobs they（ ）before leaving their hometowns
A promised B were promised C have promised D have been promised 为什么答案给的是D 用被动语态 没想明白
答
农村里淳朴老百姓背井离乡去到深圳,通常都是怀抱着一分憧憬.
这憧憬不全是自己的幻想,部分是“被人鼓动、游说”的,所以说 they've been promised 用被动语态表达“曾经有人答应过”他们“到深圳去打工可以有赚大钱的机会”