It is not easy______the answer to the difficult math problem.A、to figure outB、f

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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 It is做形式主语后面加to do形式，因此选A，其他选项不符合题意。

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