Some of you have finished Book One. ___, you can go on with Book Two.
| A．If you may |
| B．If you do |
| C．If not |
| D．If so |
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Some of you have finished Book One. ___, you can go on with Book Two.
| A．If you may |
| B．If you do |
| C．If not |
| D．If so |
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