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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 t...
题目内容：
---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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