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Every possible means(use)______ to prevent the air pollution, but the sky is sti
Every possible means(use)______ to prevent the air pollution, but the sky is sti
游客
2024-07-26
17
管理
问题
Every possible means(use)______ to prevent the air pollution, but the sky is still not clear.
选项
答案
has been used
解析
本题考查语法。根据but可知这是两个分句,所以前边应该用谓语构成一个完整的句子,而且根据句意应该是被动语态,并且是“已经被使用了”,所以应该用现在完成时的被动语态,其构成是:has/have+been+及物动词的过去分词。
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