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onthemoonisveryexciting.A.WalkingB.WalkC.ToworkD.ForwalkingC和D选项为何不对?这里不能用不定式吗?

题目详情
_______on the moon is very exciting.
A.Walking B.Walk C.To work D.For walking
C和D选项为何不对?这里不能用不定式吗?
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答案和解析
_______on the moon is very exciting.
A.Walking B.Walk C.To work D.For walking
选项是A.
【选项C.To walk不定式】表示【具体的一次动作】.选项D.For walking介词短语不能做主语.
又如:Teaching them English is my job.