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As far as I know, he is seldom, ______, absent from school.
A.if anyB.if soC.if everD.if not
C

试题分析:考查状语从句的省略。A如果有一些;B如果这样;C如果曾经有过;D如果不;句意:据我所知,如果从句有过,他也很少会缺席。If ever="If" he has ever been absent from school。如果他参加缺席上学。
点评:当状语从句的主语与主句的主语一致,且状语从句中有系动词be的时候,可以把状语从句的主语和be动词一起省略。如果状语从句中有it is的时候,it is 也可以省略。
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