The boy is _________ young to know ________.
| A．so; what to do | B．too; how to do |
| C．so; how to do | D．too; what to do |
The boy is _________ young to know ________.
| A．so; what to do | B．too; how to do |
| C．so; how to do | D．too; what to do |
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