题目内容

18．Lady Gaga has put off her concerts because of the difficulties       by the ongoing strikes．（　　）
A．causedB．causingC．to be causedD．having caused

分析 由于持续罢工造成的困难，Lady Gaga推迟了她的演唱会．

解答 答案：A
根据题干by的提示可知，cause与其所修饰的difficulties之间构成动宾即被动关系．另外，过去分词done可表示一个被动的或完成的动作．所以cause需用过去分词caused的形式作difficulties的后置定语．故选A．

点评 解题时需辨清非谓语动词与其所修饰词之间的关系：作定语时，to do表将要发生的动作；doing表正在进行的一主动动作；done表一完成的被动动作．介词by常表被动．

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B．To increase agricultural production．
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D．To invest more in agriculture．

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