判断题

在建立科学观察可信度标准的努力中,具有核心意义的是对于观察研究谬误的产生机制的全面认识与系统总结



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单项选择题

The young man worked very hard and _______ enough money to buy a new house.

A.put up
B.gave up
C.took place
D.saved up