We are glad that in the past few years, we, by joint efforts, ( ) both business and friendship.<br />A.have greatly promoted <br>B.have greatly been promoted<br>C. had greatly promoted <br>D.had greatly been promoted

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题目内容（国家开放大学英语语法）

We are glad that in the past few years, we, by joint efforts, ( ) both business and friendship.
A.have greatly promoted
B.have greatly been promoted
C. had greatly promoted
D.had greatly been promoted

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