If Helen her credit card, she could have bought the dress.A.broughtB.should bringC.had brought D.were to bring
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C解析试题分析：句意:如果海伦带着她的信用卡，她就能买那件衣服了。这里是虚拟语气，根据could have bought可以判断是对过去的虚拟，从句对过去的虚拟应该用had done，故选C。考点：考查虚拟语气的用法。
点评：本题难度适中。虚拟语气是近几年高考的热点，虚拟语气的情况复杂，形式多样，需要考生牢记它们的不同的用法，再根据不同的语境分析句子应该用哪种情况的虚拟。即学即练：I was not in Beijing last June, otherwise I _________ my son’s graduation ceremony. A.would not miss B.didn’t missC.would not have missed D.had not missed解析：C。句意：otherwise引导含蓄条件句，根据背景句是与过去事实相反，故用“情态动词+完成时”。