no one realized_____ it was until much later a.how serious a crime b.how serious crime c.what serious crime d.how a serious crime 我想crime是可数名词干什么不加a啊?

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no one realized_____ it was until much later
a.how serious a crime b.how serious crime
c.what serious crime d.how a serious crime
我想crime是可数名词干什么不加a啊?

C正确.
首先这里只能用what,无论crime是可数还是不可数,都不能选how,因为根据感叹句句式,how 后面只能跟形容词.

b

不可数名词不可以用a/an修饰,所以不用a.

C
crime在此为不可数名词,意思是“不法行为,犯罪活动”,所以前面不用冠词。