Lady Gaga has put off her concerts because of the difficulties by the ongoing strikes.
A. causing
B. to cause
C. to be caused
D. caused
网友回答
A. causing
B. to cause
C. to be caused
(答案→)D. caused
解析：考查非谓语动词.句意: 由于正在进行的罢工引起的困难.嘎嘎女士推迟了她的音乐会.过去分词作定语表示被动的动作,和被修饰词是动宾关系,结合语境额裤子选D.