You should always provide a complete sentence when you ask a question. You asked about 'has' and 'had'. 'has shown' has a time frame that extends to the present moment.
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You should always provide a complete sentence when you ask a question.
You asked about 'has' and 'had'.
'has shown' has a time frame that extends to the present moment.
'had shown' has a time frame that extends only to a past moment establish by context.
Both are correct, but you have given no context by which to judge whether one is more appropriate than the other. Ther