In the two weeks since his death, police have been posted outside the Beijing home where Mr. Zhao spent his last 15 years under house arrest and where hundreds have been assembling to pay tribute. Agents have been turning many of the mourners away.
It took 15 years before Zhao was given tribute by hundreds over his death
Correct because it states that Zhao is dead and that it took 15 years before this happened, the 15 years being the period of house arrest. I believe the play on wording has caused the AI to miss this one.
( z1 take :ARG0 ( z2 give :ARG0 ( z3 person :quant ( z4 multiple :op 100 ) ) :ARG1 ( z5 tribute :topic ( z6 die :ARG1 ( z7 person :name ( z8 name :op "Zhao" ) ) ) ) :ARG2 z7 ) )