In China, it is believed that spring is a season people often feel sleepier.A. thatB. whic

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A. that
B. which
C. as
(答案→)D. when
解析：在中国，大家都相信春天是一个人们会感觉更困的季节。这里使用了定语从句，先行词是a season，定语从句中不缺主宾表，缺少的是时间状语，所以用when引导定语从句，选D。