问题描述：
一道英语选择题,辨析词组
He is seldom,______ ,absent from school.
A.if ever
B.if some
C.if not
D.if any
选什么,为什么
He is seldom,______ ,absent from school.
A.if ever
B.if some
C.if not
D.if any
选什么,为什么
问题解答：
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