It is not always easy for the public to see _____ use a new invention can be of to human life.
| A．whose |
| B．what |
| C．which |
| D．that |
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It is not always easy for the public to see _____ use a new invention can be of to human life.
| A．whose |
| B．what |
| C．which |
| D．that |
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