If only the patient______a different treatment instead of using the antibiotics, he might still be alive now.

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问题 If only the patient______a different treatment instead of using the antibiotics, he might still be alive now.

选项 A、had received
B、received
C、should receive
D、were receiving

答案A

解析虚拟语气题。本句为if only引导的虚拟语气：与过去事实相反，谓语动词用had done；与现在事实相反，谓语动词用did。这里从句和主句在时态上为错综关系，if only部分表示的是过去发生的事情，故用过去完成时，故选[A]。

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