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【参考答案】

burn改为burning。
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Richard Nixon and John Kennedy were bitter political enemies -- Kennedy’ s victory over Nixon in 1960 had put him in the White House. Mrs. Kennedy and her children had not been back there since just after the assassination. But by 1971 the official White House portraits of John and Jacqueline Kennedy were ready to be unveiled.
填空题
gathered改为had gathered。
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