4. That was not the first time he __C_ us. I think it's high time we ____ strong actions against him.
A. betrayed...take B. had betrayed...took
C. has betrayed...took D. has betrayed...take
Sorry for goofing up on #4. I thought it said: "That's not the first time"...
Since the sentence is in Past Tense, it needs "had betrayed" instead. Sorry about that.