______youcarryoutthisplanyouwillbenefitfromitAI

______you carry out this plan, you will benefit from it.

A. If only

B. Only if

C. Were

D. Unless

正确答案：B
20．答案为B只要你实施这个计划你就会受益onlyif“只要……”引导的从句用陈述语气；ifonly“但愿……就好了”引导的从句要用虚拟语气；although“尽管”；unless“除非”