问题补充：
Only By increasing the numBer of doctors By 50 percent properly in this hospital.
A. can Be the patients
B. can the patients Be treated
C. the patients can Be treated
D. treated can Be the patients
答案：
A. can Be the patients
(答案→)B. can the patients Be treated
C. the patients can Be treated
D. treated can Be the patients
解析：考查倒装句。only位于句首时，要用部分倒装，即把助动词、情态动词或Be动词提到主语前面。当only+主语谓语句首时，不要倒装。A项，不是被动语态；C没有倒装；D是全部倒装。故选B。
【考点定位】only位于句首用部分倒装。
