英语 obtain

题目

英语 obtain
Mold's cannot produce their own food_their nourishment from living on dead
a)but obtain b)to obtain c)obtain d)obtaining

答案

选d)
“their nourishment from living on dead”做状语（注意不是状语从句）,前面只能填一个非谓语动词（不定式、动词ing、过去分词,不定式表尚未实现的动作,obtaining表伴随、方式等,过去分词表已完成或被动,综合考虑应选择d)obtaining