Experts have been warning of the health risks caused by passive smoking33.Experts have been warning ____ of the health risks caused by passive smokingA.at a time B.at one time C.for some time D.for the time为什么选择C?
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![Experts have been warning of the health risks caused by passive smoking33.Experts have been warning ____ of the health risks caused by passive smokingA.at a time B.at one time C.for some time D.for the time为什么选择C?](/uploads/image/z/11803744-64-4.jpg?t=Experts+have+been+warning+of+the+health+risks+caused+by+passive+smoking33.Experts+have+been+warning+____+of+the+health+risks+caused+by+passive+smokingA.at+a+time+B.at+one+time+C.for+some+time+D.for+the+time%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89%E6%8B%A9C%3F)
Experts have been warning of the health risks caused by passive smoking33.Experts have been warning ____ of the health risks caused by passive smokingA.at a time B.at one time C.for some time D.for the time为什么选择C?
Experts have been warning of the health risks caused by passive smoking
33.Experts have been warning ____ of the health risks caused by passive smoking
A.at a time B.at one time C.for some time D.for the time
为什么选择C?
Experts have been warning of the health risks caused by passive smoking33.Experts have been warning ____ of the health risks caused by passive smokingA.at a time B.at one time C.for some time D.for the time为什么选择C?
at a time 每次,一次(像吃药每次几片就可以用)
at one time 同时,曾经
for some time 已有一段时间
for the time 在当时
选C的理由很简单:句子用的是完成时态,所以得找一个能持续的时间表达方式, A,B,D都是点时间,不能用在完成时里.
have been warning 为现在完成进行时,表示动作从过去一直持续到现在,有可能还要持续下去,所以后面要跟一个时间段短语,应该选C。意思为:一段时间。
当然是专家多次警告了,只有这一个对阿
for some time:多次,不止一次
at a time:每次,一次
at one time:曾经,一度
for the time:在当时