It's a long time ( ).选什么?a) since i didn't see you b) before i saw you c) since i last saw you d) before i last saw you为什么?

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It's a long time ( ).选什么?
a) since i didn't see you b) before i saw you c) since i last saw you d) before i last saw you
为什么?

C
It's a long time since..是固定搭配:从...已经很长时间了.

c) since i last saw you

c
是一个持续时间

c

c
从我上次看见你,到现在已经有好长一段时间了。
其它三个答案都不对:
a.自从没见你
b.看见你以前
c.上次看见你以前