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Melinda and Helen are talking about 1 , a piece of office equipment. Actually, it has 2 to do with pigeons, and it is used to store 3 in a systematic way. Each pigeon hole is a 4 that is clearly 5 . When the papers are 6 in current use, they can be 7 to the long-term 8 . ★pigeon hole: a small open space in a desk, cabinet, or wall for keeping letters or papers.__6__(完形填空)
.no wonder
.no longer
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