If only he _______ quietly as the doctor instructed, he would not suffer so much now.

    A. lies                             B. lay

    C. had lain                         D. should lie

C


解析:

选 C.if only 意为“要是……就好了”，其后的句子谓语要用虚拟语气，同时根据 as the doctor instructed 中的过去时态可知从句是与过去事实相反，故选 C.

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