Question

【题目】—How long _____each other before they _____here?

—For about a year.

A. have they known, come B. did they know, came

C. do they know, come D. had they known, came

Answer 1

【答案】D

【解析】

考查时态。句意：—他们来这儿之前认识多久了？—大约一年了。根据句意分析，他们来到这里是过去的事，他们互相了解大约一年的时间肯定发生在来这里之前，发生在过去某一动作之前的动作，应该使用过去完成时。故D选项正确。