【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】

考查時態(tài)。句意：—他們來這兒之前認識多久了？—大約一年了。根據(jù)句意分析，他們來到這里是過去的事，他們互相了解大約一年的時間肯定發(fā)生在來這里之前，發(fā)生在過去某一動作之前的動作，應(yīng)該使用過去完成時。故D選項正確。

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