University is most worthwhile time of discovery and learning, and it is also very enjoyable and valuable experience for every one of us.
A. a；a
B. a；/
C. /；a
D. a；he
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(答案→)A. a；a
B. a；/
C. /；a
D. a；he
解析：第一空用不定冠词 a. 与most连用, most相当于 very, 只有在特定范围中表示 “最……” 才可以用最高级。experience 用作“经历”之意时，为可数名词，要与不定冠词连用。