It’s a/an ______ long time since we last saw each other.

---It’s a long time ______ I saw you last.

---It’s a long time___ I saw you last.

A、before, since
B、when, when
C、since, before
D、when ,then

It _____(be) a long time since I saw you last.

It __ a long time since we met last time.

A、 was
B、 has been
C、 are
D、 were