It is generally recognized, however, that the introduction of the computer in the early 20th century, followed by the invention of the integrated circuit during the 1960s, radically changed the process, although its impact on the media was not immediately apparent. (2002, Use of English)
本句中的分裂结构是由（）插入造成的。
A : 副词和宾语从句
B : 副词和非谓语动词词组
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