（1）表选择关系或对等关系的连接词：either…or…,neither…nor, or, as well as…, and, both…and…. （2）表因果关系或对等关系的连接词：therefore, so, as a result, as the result of …,because of, due to …,owing to, thanks to等. （3）表时间顺序的连接词：the moment, as soon as, at first, then, later,...
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