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The time when I studied at university was the happiest _____ in my life.

A. day
B. period
C. length
D. way
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科目：高中英語 來源：同步題 題型：單選題

The time when I studied at university was the happiest _____ in my life.
[     ]
A. day
B. period
C. length
D. way

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