—It is a long time ______ I saw you last.
—Yes, and what a pity it is since it will be a long time ______ we see each other again.
| A．before; since | B．when; when |
| C．since; before | D．when; then |
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—It is a long time ______ I saw you last.
—Yes, and what a pity it is since it will be a long time ______ we see each other again.
| A．before; since | B．when; when |
| C．since; before | D．when; then |
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