______ if I had arrived yesterday without letting you know beforehand?A. Would you be surprisedB. Were you surprisedC. Had you been surprisedD. Would you have been surprised

步骤 1：分析句子结构
句子的主句部分是“if I had arrived yesterday without letting you know beforehand”，这是一个虚拟语气的条件句，表示与过去事实相反的假设。因此，主句部分需要使用虚拟语气的结构。

步骤 2：确定主句的虚拟语气形式
由于条件句表示与过去事实相反的假设，主句部分需要使用“would have done”的形式。因此，主句部分应为“Would you have been surprised”。

步骤 3：选择正确答案
根据上述分析，正确答案应为D选项。