Experts have been warning ---of the helth risks caused by passive smoking
问题描述：
Experts have been warning ---of the helth risks caused by passive smoking
A at a time B at one time C for some time D for the time 选C 这 不是时间状语吗一段时间,那warn of sth有这搭配吗 不是 warn sb of sth 的搭配吗
答
我先翻译一下这个句子吧,专家多次警告被动吸烟会引发健康危机.有一个单词helth是不是写错啦,应该是health吧,然后就是你的问题啦,这个句子你应该这么看,experts have been warning for some time……这个是说“专家多...