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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 _...
题目内容：
—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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