单选题 Anglo-Saxon literature, ______, the Old English literature, is almost exclusively a verse literature in oral form, whose creators for the most part are unknown.

A、 that is
B、 in the first place
C、 to start with
D、 most important of all

【正确答案】 A

【答案解析】[解析] 句意：安格鲁撒克逊文学，也就是古英语文学，几乎是惟一的口头诗歌文学，大多数传作者都是未知的。that is也就是。