[文法重點] Sequence of Tenses in Sentences Containing Noun Clauses 主要子句與名詞子句的時態
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http://faculty.deanza.edu/flemingjohn/stories/storyReader$23
http://ananedu.com/begrammar/02/02-15.html
http://210.240.55.2/~t311/moe/engb5/b5grammar/b5indirect.htm