问题标题:
【九年级英语上册9.Thedoctorwillstayupallnighttodoanoperationonyou__________.AifitnecessaryBifyouarenecessaryCifnecessaryDifisnecessar】
问题描述:

九年级英语上册

9.Thedoctorwillstayupallnighttodoanoperationonyou__________.

AifitnecessaryBifyouarenecessaryCifnecessaryDifisnecessar

顾诵芬回答:
  选C,ifnecessary,省略了itis,ifitisnecessary
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