问题
选择题
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
答案：C
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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：C