As far as I know, he is seldom, , absent from school.
A. if any
B. if so
C. if ever
D. if not
网友回答
A. if any
B. if so
(答案→)C. if ever
D. if not
解析：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。