If only the patient ______ a different treatment instead of using the antibodies

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问题 If only the patient ______ a different treatment instead of using the antibodies he might still be alive now.

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

答案 A

解析这里是由if only引导的虚拟语气，因为是对过去事实的虚拟，因此谓语动词应该用had done形式，故正确答案为had received，选A。

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