Smoking(know)______ to increase a person’s risk of developing lung cancer.

admin2014-10-30 53

问题 Smoking(know)______ to increase a person’s risk of developing lung cancer.

选项

答案is known

解析本题考查被动语态的用法。smoking与know之间是被动关系，所以用被动语态is known。

转载请注明原文地址:https://www.kaotiyun.com/show/8biK777K

大学英语三级A级

相关试题推荐

随机试题

最新回复(0)