Half an hour has been made full ______ of _____ the problem.
| A．using; studying | B．use; to study |
| C．to use; to study | D．use; studying |
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Half an hour has been made full ______ of _____ the problem.
| A．using; studying | B．use; to study |
| C．to use; to study | D．use; studying |
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