题文
It is really crazy ________ Peter to let his ________ son swim alone in the river.
| A．for; 5 years old | B．of; 5 years old |
| C．for; 5-years-old | D．of; 5-year-old |
It is really crazy ________ Peter to let his ________ son swim alone in the river.
| A．for; 5 years old | B．of; 5 years old |
| C．for; 5-years-old | D．of; 5-year-old |
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