Her short stay in Kentucky in the mid-nineteen hundreds was very important
to author Mary Holmes,__________ provided the background to several of
her novels.
(A) it was
(B) for it
(C) much of
(D) by then
前面提到 was very important可以知道空格前面為一個句子,故刪除A與 C A 無連接詞 C 無連接詞,且無主詞 後面句子是要解釋前句子的 was very important 故用語意選出最適合的答案 B For = because= in that = as = since的用法 D by then不合語意