【单选题】 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.
A．careful
B．cautious
C．deserved
D．helpful
网考网参考答案：D
网考网解析：
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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