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

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问题 If only the patient ______ a different treatment instead of using the antibiotics, he might still be alive now. （2007年考试真题）

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

答案 A

解析本题考查if only后面的从句里谓语部分用过去完成时表示对过去情况的虚拟。

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