A ,虚拟语态
还原一下应该是：
will you be surprised if i arrive ...without letting you know beforehand?
对虚拟语气提问不能用过去式.因为是虚拟的状态,并未发生事实.不存在过去式.
所以不能选D.
____ if I had arrived yesterday without letting you know bef
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