_____ this experiment is not difficult.A.Having done B.Being done C.To do D.Done

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_____ this experiment is not difficult.A.Having done B.Being done C.To do D.Done
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_____ this experiment is not difficult.A.Having done B.Being done C.To do D.Done
_____ this experiment is not difficult.A.Having done B.Being done C.To do D.Done

_____ this experiment is not difficult.A.Having done B.Being done C.To do D.Done
C
不定式做主语,“要做这个实验很容易”
不定式一般指具体的将要做的事

C 不是doing就是to do

c

b

应该选择C,这个句子缺乏主语,动词不定式做行为主语,表主动。