There is the fact that learners of English may be teaching in either American or British forms.

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问题 There is the fact that learners of English may be teaching in either American or British forms.

选项

答案teaching→taught

解析 分析句子可知,learners和teach之间为别动关系,learners may be teaching 应是要表示被动语态,所以应采用teach的过去分词形式。
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