单选题：It is estimated that seventy percent of the hotel guests are

题目内容：

It is estimated that seventy percent of the hotel guests are willing to participate in the green program launched by the hotels．

参考答案：

答案解析：

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About two-thirds of American Internet users have shopped online last year．

分类：英语四级题型：单选题

分类：英语四级题型：单选题