We still remember once round the famous tower when we were young.A. having takenB. to be t

问题补充：

We still remember once round the famous tower when we were young.

A. having taken

B. to be taken

C. to have taken

D. having been taken

答案：

A. having taken

B. to be taken

C. to have taken

(答案→)D. having been taken

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