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语法改错题!A(For) more than a century,wooden ships called "skipja

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语法改错题!
A(For) more than a century,wooden ships called "skipjacks" were B (regularly used) C( to harvest) oysters in Chesapeske Bay,but only a few D( such vessels) remain in service today.E.( no error)
The codfish inhabits the shallow waters of the ocean:A( they are) especially plentiful in B(such areas as) the North American conitinental shelf,C(where) the depth is rarely D( greater than) 200 or 300 feet.E(no error)
1.E
2.A 改成it
再问: 1 for+一段时间 不是应该后面用完成时么
再答: 都有were了,怎么had been
再问: 所以说为什么就不能是A错了呢 没想明白
再答: 这段时间确实是过去,但是听他已经有了结尾,所以对于一个过去的过去已经就结束的东西都用过去式,不用过去完成时,而for是表明时间长度的,所以没错,再说后面都有were了,就暗示你肯定是过去式,明白?