英文 The lost boy ---------(not find)so far.

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英文 The lost boy ---------(not find)so far.

英文 The lost boy ---------(not find)so far.
英文 The lost boy ---------(not find)so far.

英文 The lost boy ---------(not find)so far.
hasn't been found
so far是现在完成时标志词.
而被动语态是要be加过去分词
那个丢了的男孩还没有被找到

had not been found

The lost boy has not been found so far

has not be found

hasn't been found ,so far与现在完成时连用