2. 外语
  3. After making observations for a week in the plant, the industrial engineer made a number of very constructive suggestions in an

After making observations for a week in the plant, the industrial engineer made a number of very constructive suggestions in an

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问题 After making observations for a week in the plant, the industrial engineer made a number of very constructive suggestions in an oral report to the manager.
选项 A、careful
B、cautious
C、deserved
D、helpful
答案D
解析 constructive意为“建设性的、有助益的”。四个选项的含义分别是：“认真的”、“小心谨慎的”、“当之无愧的”、“有帮助的”，故D为正确答案。
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