语法填空-单句语填 较易0.85 引用1 组卷140
Ecotourism has ________ (it) origin with the environmental movement of the 1970s. It was not widely accepted as a travel concept until the late 1980s. During that time, increasing environmental awareness made it desirable. (所给词的适当形式填空)
2022高三上·全国·专题练习
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