30. When he was only thirty years old, he had already experiencedmost people only experien

发布时间:2020-08-16 07:18:38


30. When he was only thirty years old, he had already experienced    most people only experience when they are much older.
A. what
B. which
C. who
D. When

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(答案→)A. what
B. which
C. who
D. When
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