The most {{U}}crucial{{/U}} problem any economic system faces is how to use its scarce resources.

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:15:36 免费下载:《单选题》Word试卷

The most {{U}}crucial{{/U}} problem any economic system faces is how to use its scarce resources.
A.puzzling
B.difficult
C.terrifying
D.urgent

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