---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; sinceB．since; whenC．since; beforeD．when; before
C
考查連詞。本題考查It + is /has been+ time + since 自從...起+ sb /sth did ；It + was /will be+ time + before 多久之后+ sb /sth did/do 兩個結(jié)構(gòu)，故選C。
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