To be well fit for the job, _______.
A.a good knowledge of physics is neededB.one needs to have a good knowledge of physicsC.it is required that one should have a good knowledge of physicsD.a good knowledge of physics is important在线课程B
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是合适的答案。