2018年6月英语四级作文万能句：基本原因
3-1-1. 基本原因 --- 分析某事物时, 用此句型说明其基本的或者多方面的原因.. The answer to this problem invovles many factors. For one thing... For
another...... Still another ...
. A number of factors , both physical and psychological affect ....
/both individual and social contribute to ....
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