.
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 |
推荐试卷
.
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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