It is not easy______ the answer to the difficult math problem.

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问题 It is not easy______ the answer to the difficult math problem.

选项 A、to figure out
B、figuring out
C、figure out
D、being figured out

答案A

解析句意：计算出复杂的数学题的答案并非易事。本题考查动词不定式作主语。It is(not)+adj．／n．+to do句型中it做形式主语，动词不定式to do是真正的主语。故选A。

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