—It’s a long time________I saw you last.
—Yes，and what a pity it is now that it will be a long time________we see each other again.
| A．before；since | B．since；when | C．since；before | D．when；before |
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—It’s a long time________I saw you last.
—Yes，and what a pity it is now that it will be a long time________we see each other again.
| A．before；since | B．since；when | C．since；before | D．when；before |
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