It is a fact________most deaths from lung cancer are caused by smoking.

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问题 It is a fact________most deaths from lung cancer are caused by smoking.

选项 A、that
B、how
C、what
D、which

答案A

解析 事实上,大多数肺癌患者都是死于吸烟。本题考查同位语从句的用法。由抽象名词fact可知空格之后的从句很可能是同位语从句。该从句意义完整,故空格处只需填入起语法衔接作用的连接词,而不是连接代词或连接副词,因此选项A正确。
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