选A,最佳答案应该是were,用was也可以,这里考察的是虚拟语气,表示与将来事实可能相反.
句意是：他说他如果有空的话他就会帮助我们解决数学问题.表达的意思是,他没有空,他不会帮我们.
He said he would help us with our maths if he___free
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