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

試題分析：考查狀語從句的省略。A如果有一些；B如果這樣；C如果曾經(jīng)有過；D如果不；句意：據(jù)我所知，如果從句有過，他也很少會(huì)缺席。If ever="If" he has ever been absent from school。如果他參加缺席上學(xué)。
點(diǎn)評(píng)：當(dāng)狀語從句的主語與主句的主語一致，且狀語從句中有系動(dòng)詞be的時(shí)候，可以把狀語從句的主語和be動(dòng)詞一起省略。如果狀語從句中有it is的時(shí)候，it is 也可以省略。
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