题文
It has been widely accepted that only when the students take an active part in the class activities _______ the most effective.
| A．teaching will be | B．will teaching be |
| C．has teaching been | D．teaching has been |
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It has been widely accepted that only when the students take an active part in the class activities _______ the most effective.
| A．teaching will be | B．will teaching be |
| C．has teaching been | D．teaching has been |
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