they realized that it was() to argue with him.so they stopped arguing

题目

they realized that it was() to argue with him.so they stopped arguing
Atidy
Buntidy
Cuseful
Duseless

答案

选D.useless
没有作用的,无用的.
整句意思:
他们认识到和他吵架没有用,所以他们停止了吵架.
realize 认识到,意识到
argue 争吵,吵架