At last they an agreement it.
A. reached; on
B. concluded; at
C. arrived at; about
D. e to; in
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(答案→)A. reached; on
B. concluded; at
C. arrived at; about
D. e to; in
解析：本题考查动词和解词辨析。句意：最终他们就此达成协议。reach/arrive at / e to an agreement达成协议; agreement on sth. 在某方面的协议。