23．We still remember onceround the famous tower when we were young.A. having taken B. to b

问题补充：

23．We still remember onceround the famous tower when we were young.

A. having taken

B. to be taken

C. having been taken

D. to have taken

答案：

A. having taken

B. to be taken

(答案→)C. having been taken

D. to have taken

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