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Dr. Hanson was invited to give a lecture to （） the 20-year anniversary of the 9/11 attacks.
Dr. Hanson was invited to give a lecture to （） the 20-year anniversary of the 9/11 attacks.
A.considerate
B.commemorate
C.replicate
D.dilute
正确答案：commemorate
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硕士生英语进阶
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