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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