题目内容
Not until 1931 ________ the official anthem of the United States.
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All of the plants now raised on farms have been developed from plants _______ wild.
After twenty-years abroad, William came back only _______ his hometown severely damaged in an earthquake.
You are just the same ________ you were the day when I first saw you.
_________ struck, a turning fork produces an almost pure tone, retaining its pitch over a long period of time.
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