Shenzhen was built in used to be poor and small fishing village.

2
深圳建在哪里原来是小渔村的地方。where 表示地方，哪里。

应该选which
in which = where
where引导从句是关系副词，前面不能用介词in啦

没有正确答案 应该用What
选择where Shenzhen was built in the place where used to be poor and small fishing village.
选择which Shenzhen was built in the place where used to be poor and small fishing village.

也许是，深圳以前是一个既贫穷又小的渔村吧。