He is _____(在计算)the math problem那个空怎么填啊?He is _____(在计算)the math problem 那个空怎么填啊?是numbering 么

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He is _____(在计算)the math problem那个空怎么填啊?
He is _____(在计算)the math problem 那个空怎么填啊?
是numbering 么

solving/doing

figuring

counting

working out