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1.替代刚提到过的同一事物[例1]I was disappointed with the film.I hadexpected__to be much better.A.that B.this C.one D.it分析:替代前面的the film,用it,故选D.2.指代前面整个句子的意思[例2]The doctor advised Vera strongly that sheshould take a holiday,but____didn't help.