英语单选 It is how the young man had learned five laanguages (that) attracted the audience'sIt is how the young man had learned five laanguages (that) attracted the audience's interest.这是个强调句 如果It is how the young man had learned five laanguages （what） attracted the audience's interest.如果选了what 把it看做形式主语是否可以?我想问的是what attracted the audience's interest is how the young man had learned five laanguages为什么不行？

应该是不可以的。我觉得应该是what attracted the audience's interest is（that） how the young man had learned five laanguages ，变成主语从句。形式主语it的使用是为了避免主语太长，造成“头重脚轻”，没有后面接what引导的从句的习惯
另外，这应该是单项选择吧，应该选择最佳选项

对不起，it作形式主语必须是这样的句型：
It + be + adj/n. + to-v/v-ing/that-从句，还有一点，it作形式主语时，可以把真正的主语换到it的位置，意思不变。
如：
It is easy to learn English.
=To learn English is easy.
而强调句中的it is/was ... that...是可以去掉，意思不变。
你这句：
可改成：
How the young man had learned five languages attracted the audience's interest.
问题补充：
我想问的是What attracted the audience's interest is how the young man had learned five languages为什么不行？
这句话正确！！！
又如：
What intereted me was how he got to the place.

what attracted the audience's interest is how the young man had learned five languages这个句字当然是可以的啊.主系表结构,主语从句和表语从句,显得多对平衡啊
可是It is how the young man had learned five languages （what） attracted the audience's interest.这个结构显得有点头轻脚重了点吧.it's +表语+主从 的结构中通常是表语较短的情况.一个名词或形容词短语..而主语通常是从句.
这个It is how the young man had learned five languages (that) attracted the audience's interest
句了中当然是选that 把它看作是个强调句型的要好.

我在高二的时候也被这个问题给困住了，当时也在知道问了，现在看看好怀念。好激动了，现在都大学毕业了，以前高中学英语是那么疯狂。

如果把it看作形式主语,真正的主语就是how the young man had learned five laanguages 是一个how引导的主语从句,谓语动词为attracted 宾语是the audience's interest就不存在what的问题了.懂了吗?