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

问题补充：

As far as I know, he is seldom, , absent from school.

A. if any

B. if so

C. if ever

D. if not

答案：

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。