首先,主句 every year a flood of farmers arrive...中 “arrive" 用的是一般现在时,表示的是常年发生的现象,从句就应该与主句一致,也应该是现在时态,所以a 跟b 被排除.
然后,因为是被动语态,所以要be promised 形态出现,所以答案只能是 D.
不要被误导了,这里的before 对本题完全没有意义.
Every year a flood of farmers arrive in Shenzhen for the mon
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