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He is seldom, ______, absent from school.
A．if someB．if anyC．if notD．if ever
D
if ever 意為“如果曾經(jīng)有過或即使有過的話”，其作用是為了緩和語氣。如：
It occurs seldom, if ever．即使有其事，也必不多。She seldom, if ever, goes to the cinema．她幾乎從不去看電影。
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