To be well fit for the job, _______.
A.a good knowledge of physics is needed
B.one needs to have a good knowledge of physics
C.it is required that one should have a good knowledge of physics
D.a good knowledge of physics is important
网友回答
B解析不定式作状语时，其逻辑主语应是句子的主语，因此B项中的one是合适的