Ryunosuke Akutagawa‘s knowledge of the literatures of Europe, China andthat of Japan were instrumental in his development as a writer, informing his literary style as much as the content of his fiction.
1)that of Japan were instrumental in his development as a writer, informing his literary style as much as
2)that of Japan was instrumental in his development as a writer, and it informed his literary style as well as
3)Japan was instrumental in his development as a writer, informing both
...
1)that of Japan were instrumental in his development as a writer, informing his literary style as much as
2)that of Japan was instrumental in his development as a writer, and it informed his literary style as well as
3)Japan was instrumental in his development as a writer, informing both
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