2017年6月英语四级词汇复习：表顺序与时间

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　　顺序关系：
        　　first; second;thirdly;next;then;at the outset(在开始时)，following this;at
this time;now; at this point;after;afterward;after this; subsequently;lastly;finally;consequently;before this;previously; preceding this;simultaneously;concurrently(同时).
        　　时间关系：
        　　at once;immediately;at length;in the mean time;meanwhile;at the same
time;in the end;then;soon;not long after;later;at once;at last;finally;
some time ago;at present;all of a sudden;from this time on;from time to
time;since then;when;whenever;next point;a few minutes later;formerly; as;once;since;occasionally;in a moment;shortly; whereupon;previously