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第1题

The thirty-story building is one of the most challenging engineering projects they have ever ________ . A. undergone
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第2题

Social ________ vary from country to country. A. habits B. traditions C. customs D. manners
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第3题

Promotion is ________ upon your record of success. A. restrain B. royal C. department D. de
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第4题

She bacame a ________ customer of the bookshop. A. continuous B. constant C. content D. con
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