Door<br>Alvin opened the door. He surprised his Wife. His wife had a visitor. His name was Frank. His wife was cheating on him with Frank.
Frank knew Alvin was coming then.
Reason:  They were surprised; since it was an affair, Frank would not have been there had he known Alvin was coming.  Why:  It couldn't decided between Incorrect or Neither (this one was right on the line!)
( z1 know :ARG0 ( z2 person :name ( z3 name :op "Frank" ) ) :ARG1 ( z4 come :ARG1 ( z5 person :name ( z6 name :op "Alvin" ) ) :time ( z7 then ) ) )