--How can I make progress in my study，Sir？
--_______ an effective learner，you should find some good approaches．
| A．Being | B．Having been |
| C．To have been | D．To be |
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--How can I make progress in my study，Sir？
--_______ an effective learner，you should find some good approaches．
| A．Being | B．Having been |
| C．To have been | D．To be |
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