I didn't help him. I would have, however, I didn't have the money.
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参考答案:
举一反三
【单选题】The process of manipulating one or more independent variables and measuring their effect on one or more dependent variables while controlling for the extraneous variables is called a(n、________.
【判断题】The process of manipulating one or more independent variables and measuring their effect on one or more dependent variables while controlling for the extraneous variables is called an experiment.