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Smoking (know) ________ to increase a person’s risk of developing lung cancer.is
Smoking (know) ________ to increase a person’s risk of developing lung cancer.is
游客
2023-09-18
36
管理
问题
Smoking (know) ________ to increase a person’s risk of developing lung cancer.
选项
答案
is known
解析
smoking与know之间是被动关系,所以用被动语态is known。动词的过去分词形式一般是在原形后面加-ed,但也有一些词的变化比较特殊,需特别记忆,如know—known, begin—begun等。
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