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。而主句表示的是现在。
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