问题
选择题
To succeed in doing an experiment,________.
A．carefulness is needed
B．carefulness is one needs
C．one needs to be careful
D．one need be careful
答案
答案：C
主句没有主语，而D项时态不合。
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To succeed in doing an experiment,________.
A．carefulness is needed
B．carefulness is one needs
C．one needs to be careful
D．one need be careful
答案：C
主句没有主语，而D项时态不合。