It ____ Jack twenty minutes ____ the math problem yesterday.
| A．took; to work out | B．takes; worked out |
| C．has taken; work out | D．is taking; working out |
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It ____ Jack twenty minutes ____ the math problem yesterday.
| A．took; to work out | B．takes; worked out |
| C．has taken; work out | D．is taking; working out |
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