【题目】At the end of the meeting, it was announced that an agreement ______.
A.has reached
B.had reached
C.has been reached
D.had been reached

【答案】D
【解析】句意：在会议结束时，宣布一项协议已经达成。过去完成时表示一个动作或状态在过去某一时间或动作之前已经完成或结束,即“过去的过去”.这是一个复合句宾语从句,主句的谓语动词用了一般过去时,所以从句中的谓语动词要用表示过去的某种时态.该句中要用过去完成时.agreement作reach的逻辑宾语,所以要用被动语态，故选D。