This is the only one of the oldest customs that down in this area so far.A. was keptB. we

问题补充：

This is the only one of the oldest customs that down in this area so far.

A. was kept

B. were kept

C. has been kept

D. have been kept

答案：

A. was kept

B. were kept

(答案→)C. has been kept

D. have been kept

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