question: What did the US Air Force 's daytime attacks cause the KPA to do ?
answer: to hide in tunnels by day and move only at night
turker_answer: The US Air Force 's daytime attacks cause the KPA to hide in tunnels by day and move only at night .
rule-based: The US Air Force 's daytime attacks caused the KPA to to hide in tunnels by day and move only at night .