题文
—Mum, could I go out to play now?
—Let me see. . . Yes,__________ you have finished all your school assignments.
| A．until |
| B．unless |
| C．while |
| D．since |
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—Mum, could I go out to play now?
—Let me see. . . Yes,__________ you have finished all your school assignments.
| A．until |
| B．unless |
| C．while |
| D．since |
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