____untreated,some small diseases can bring about serious problems.A leaving B left C to leave Dto be left选哪个?

____untreated,some small diseases can bring about serious problems.A leaving B left C to leave Dto be left选哪个?
____untreated,some small diseases can bring about serious problems.
A leaving B left C to leave Dto be left选哪个?

____untreated,some small diseases can bring about serious problems.A leaving B left C to leave Dto be left选哪个?
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.

B 这是过去分词作状语的用法，表被动

被遗留下未经处理的一些小的疾病会导致严重的问题
正常的句子是
some small diseases 《which was left untreated 做定语 》 can bring about serious problems.
选择B
希望能采纳，谢谢

答案选B, 过去分词作状语。leave 在此不是离开，而是使。。。。。。，具体构成是leave+宾语+补足语。small disease 是leave 的逻辑宾语，因此，使用过去分词，表示被动。