What's on the desk?There is ___pencil on it?为什么填a

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What's on the desk?There is ___pencil on it?为什么填a
What's on the desk?There is ___pencil on it?
为什么填a

What's on the desk?There is ___pencil on it?为什么填a
因为pencil是个可数名词,如果你这个搞不清楚,可以看be动词,is修饰单数的,而are修饰复数的,而这里是is,所以填a.

there be句型的be是看后面的名词单复数的情况来定的哦