题目

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 答案：D 根据题意可知，cause和difficulties是动宾关系，因此用cause的过去分词形式。过去分词短语caused by the ongoing strikes在句中作定语，修饰difficulties。

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