试题题干
The history of English is conventionally divided into three periods usually called Old English or Anglo-Saxon, 
, and Modern English.
参考答案
试题解析
本题主要考查英语历史时期的划分。
The history of English is conventionally divided into three periods usually called Old English or Anglo-Saxon, Middle English and Modern English.
英语的历史传统上分为三个时期，通常被称为古英语或盎格鲁-撒克逊英语、中世纪英语和现代英语。
所以空白处缺的是“中世纪英语”：Middle English