一个英语时态题目Floods and bad farming over the years ruined a land

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一个英语时态题目
Floods and bad farming over the years ruined a land that ______ and made it miserably poor.
A.was once rich B.had once been rich C.have once been rich D.was once being rich
选哪个,详细讲下为什么

答案：B　　解析：had been 发生在过去时（ruined）之前,故用过去完成时,如：He sang a song that had been popular for a long time.

一个英语时态题目Floods and bad farming over the years ruined a land 英语选择求解释floods and bad farming over the years have ruined a l i got caught in the rian and my suit ____ A has ruined B bad over the years 是什么时态柡志 ___ of the land is used for farming A How many B how much C The early warning of floods,broadcast over the radio and on years ago和over the years用什么时态 over the past fews years与什么时态连用? over the past few years 用什么时态句中有Over the past ten years 应用什么时态? over the following years 应该用什么时态? 英语作文,题目:The land of dream