选B.
Left untreated,some small diseases can bring about serious problems.
被丢在一边不得到治疗的话,一些小的疾病会带来严重后果.
本题考查非谓语动词.主语是some small diseases ,它和leave之间是被动的关系,所以排除A,C两个表示主动的选项.B和D的区别在于,B表示的动作已经完成,D是将要进行,动作还未开始.根据题意,“被丢在一边”显然是已经进行完的,所以选B.
____untreated,some small diseases can bring about serious pr
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