【題目】—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

【答案】D

【解析】

考查時(shí)態(tài)。句意：—他們來(lái)這兒之前認(rèn)識(shí)多久了？—大約一年了。根據(jù)句意分析，他們來(lái)到這里是過(guò)去的事，他們互相了解大約一年的時(shí)間肯定發(fā)生在來(lái)這里之前，發(fā)生在過(guò)去某一動(dòng)作之前的動(dòng)作，應(yīng)該使用過(guò)去完成時(shí)。故D選項(xiàng)正確。

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