2. 外语
  3. It is not easy______the answer to the difficult math problem.

It is not easy______the answer to the difficult math problem.

admin2019-07-18  27
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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