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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 由于持續罷工造成的困難,Lady Gaga推遲了她的演唱會.

解答 答案:A
根據題干by的提示可知,cause與其所修飾的difficulties之間構成動賓即被動關系.另外,過去分詞done可表示一個被動的或完成的動作.所以cause需用過去分詞caused的形式作difficulties的后置定語.故選A.

點評 解題時需辨清非謂語動詞與其所修飾詞之間的關系:作定語時,to do表將要發生的動作;doing表正在進行的一主動動作;done表一完成的被動動作.介詞by常表被動.

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