题目内容：

I_to go to the lecture yester,but I had an unexpected visitor.A.meantB.would meanC.was to mean
D.had meant答案为什么选D?

优质解答

后面有had,就说明是过去时,而mean to go to the lecture发生在过去的过去,也就是有访客之前,所以用过去完成时had done的结构