题文
________ the difficult maths problem, I have consulted Professor Russell several times.
| A．Working out |
| B．Worked out |
| C．To work out |
| D．Work out |
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________ the difficult maths problem, I have consulted Professor Russell several times.
| A．Working out |
| B．Worked out |
| C．To work out |
| D．Work out |
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