maybe it is ____they have a harder life.A.what B.how C.why D

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maybe it is ____they have a harder life.A.what B.how C.why D.because
怎么选D呢?我选的C,但老师说D符合意思,是不是跟语法神马的有关……

看意思吧,语法的话两个都是表语从句,做前面is的表语.
it is why... 这是为什么... /这就是...的原因, 说明前面的句子是这个句子的原因
如： Tom was ill. It is why he didn't come yesterday.
汤姆生病了.这是他昨天没来的原因.（生病是没来的原因）
it is because... 这是因为... 说明前面的句子是这个句子的结果
如：You are fat. it is because you eat too much.
你很胖.这是因为你吃太多了. （胖的原因是吃太多）
你这个句子不完整,要看前面的那个句子和这个句子是什么关系,如果是原因就是why,结果就用because

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