It's （a so interesting topic） that all students joined the discussion这句子是不是错在冠词上?还是其它地方
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It's （a so interesting topic） that all students joined the discussion这句子是不是错在冠词上?还是其它地方
It's （a so interesting topic） that all students joined the discussion
这句子是不是错在冠词上?还是其它地方
It's （a so interesting topic） that all students joined the discussion这句子是不是错在冠词上?还是其它地方
这里牵扯到so和such的用法.应该为 so interesting a topic
1、so + 形容词/副词 + that + 从句,如：
This story is so interesting that I want to read it again.（这个故事如此有趣以至我想再读一次.）
He spoke so quickly that I couldn't follow him.
（他说得如此快以至我不能跟上他.）
2、so+形容词/副词+(a/an)+(单数)复数可数名词／不可数名词+that+从句,如果句中的名词是单数可数名词,其前就要用不定冠词a或an,如果是复数可数名词或者不可数名词,前面就不用冠词,如：
She is so lovely a girl that everyone loves he（这个故事如此有趣以至我想再读一次.）r.
（她是如此可爱的一个女孩,以至每个人都喜欢她.）
Those are so beautiful flowers that the girl wants to pick them.（那些花是如此漂亮以至那个女孩想要摘下它们.）
3、such+a/an+形容词+单数可数名词+that+从句,如：
She is such a lovely girl that everyone loves her.（她是如此可爱的一个女孩,以至每个人都喜欢她.）
It is such an interesting story that I want to read it again.（这是一个如此有趣的故事以至我想再读一次.）
4、such+复数可数名词/不可数名词+that+从句,如：
He showed such concern that people took him to be a relative.（他表现得如此关心以致于人们都把他当作亲戚了.）