It's four days since........

What is your choice?

A seems okey.

YahyacanIt's four days since they _____ us because they _____ still away.

(D) called / are

I also go for (d).

I'd say:

YahyacanIt's been four days since they called us, because they are still away.

KooyeenI'd say:

YahyacanIt's been four days since they called us, because they are still away.

LoojkaOr maybe even "It's been four days since they haven't called us,..." (conveying the opposite meaning, of course)

Hey, that's true! I think the answer depends on the context, and this is good too, to me:
"It's been four days since they haven't called us, because they were still away."

No - not grammatical. I twould have to be in this way:

They haven't called us for four days [since/because] they are away

The original exercise question can only be answered with #d.

Ooops, you're right...
...on second thought, I think I would need a really weird context...
I was thinking of "It's been four days since they haven't called us..." as "They call us every day, but four days ago they didn't call us..."
But then "not calling" should be something that happens regularly, that's too weird and so I was wrong. It would normally be