____________ of economic cycles been helpful in predicting turning points in cycles, they would have been used more consistently. 

Câu hỏi :

        ____________ of economic cycles been helpful in predicting turning points in cycles, they would have been used more consistently. 

A Psychological theories have

B Had psychological theories have

C Psychological theories

D Psychological have theories

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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