请各位英语高手帮哈忙,it has been proved ___ eating vegetables in childhood helps to protect you against serious illness in later life.A.if B.because C.when D.what这是为什么啊
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请各位英语高手帮哈忙,it has been proved ___ eating vegetables in childhood helps to protect you against serious illness in later life.A.if B.because C.when D.what这是为什么啊
请各位英语高手帮哈忙,
it has been proved ___ eating vegetables in childhood helps to protect you against serious illness in later life.A.if B.because C.when D.what
这是为什么啊
请各位英语高手帮哈忙,it has been proved ___ eating vegetables in childhood helps to protect you against serious illness in later life.A.if B.because C.when D.what这是为什么啊
正确答案应该是that.
翻译：在儿童时期食用蔬菜有助于保护你抵抗严重的疾病,这一点已经被证实/证明了.
解释：
1. 题中的It为形式主语,谓语是has been proved（现在完成时的被动语态）,真正的主语是后面的从句___ eating vegetables in childhood helps to protect you against serious illness.
2. 而该从句明显不缺少任何成分,所以只能选用that.
that引导主语从句等名词性从句时,在从句中不作任何成分,只起引导作用.
如：I know that you are a teacher.
3. if不能引导主语从句,排除A；
because引导原因状语从句,句意也不通顺；
从句已经有了时间状语in childhood,并不缺少when,排除C；
从句中不缺少表示事物“什么”的成分（what）,所以也可以排除what.
不可能是what,应该是that才对啊，题有问题吧
不对，应该是that