一道英语四级题目,There is no evidence【 that】 antibiotics,anti-viral

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一道英语四级题目,
There is no evidence【 that】 antibiotics,anti-viral medicines or steroids help,so doctors can offer only supportive care.
我知道这是同位语从句,不缺成分,所以【】里用that不用whether,
但我有2个问题：
1.如果一定要用whether的话,这句子该怎么变呢?
2.填whether不对的原因还有什么?感觉whether也很顺口

题目考查的的确是同位语从句,但不选whether的原因不是这个,大多数人都知道同位语从句的引导词是that,但其实,whether也可以引导同位语从句的~
英语中引导同位语从句的词通有连词that,whether,连接代词what,who.连接副词how,when,where等.（注：if,which 不能引导同位语从句.）
　　比如He must answer the question whether he agrees to it or not.他必须回答他是否同意这样一个问题.
OK,介绍完这些背景后,开始回答楼楼的问题.
首先回答楼楼的第二个问题~英语和中文不同,我明白你想表达的意思是“没有证据证明xxxxx是否有效”,但注意,这是我们平时很随意的中文表达,在英文里,这种说法是不存在的.正如楼上朋友所说,There is no evidence/doubt that...这是固定搭配,为什么呢?仔细观察可以发现 no doubt和no evidence都是表达的单项可能性,即它们所传达出的结论只对多种可能性中的一种有效.举个例子吧,一个人被怀疑犯了罪,而他有不在场的证据,这个证据只能证明他没有犯罪,而不能证明他犯了罪,明白了不?所以,这题只能选that,而不能选whether.顺口是固然的,这和我们平时的语言习惯有关,可在逻辑性强而不浪漫的英语环境中这就不对咯!
还有楼楼的第一个问题~
应该可以解决了吧!既然同位语从句只能表达一种可能性,那么定然不能用whether了,所以第一题没有答案.
简单一点来说,There is no evidence/doubt that...就是约定俗成的用法,楼楼不必太钻牛角尖啊!

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