I finished my exams yesterday.A. end of yearB. end of-yearC. end-of-yearD. end-of-year’s

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A. end of year
B. end of-year
(答案→)C. end-of-year
D. end-of-year’s
解析：此题重点考查合成形容词的基本构成，数词+名词(+形容词)；合成形容词中的名词(year, hour, metre, month等)必须用单数形式。