------ It's a long time _____ I last saw you．
------Yes, and it will be another month _____ we can meet again．
| A．before; when | B．when; since | C．since; while | D．since; before |
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------ It's a long time _____ I last saw you．
------Yes, and it will be another month _____ we can meet again．
| A．before; when | B．when; since | C．since; while | D．since; before |
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