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31. In order to attract more tourists, the government could either improve safety by hiring more police or improve its appearance by repairing old buildings and streets. Which way do you think is more effective?练习人数: 24
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32.练习人数: 26
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33.练习人数: 7
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34.练习人数: 6
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35.练习人数: 14
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36.练习人数: 50
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37.练习人数: 5
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38.练习人数: 9
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39.练习人数: 10
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40.练习人数: 2




