Our school_________(hold) the Sino-US exchange culture activity several times.

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Ourschool_________(hold)theSino-USexchangecultureactivityseveraltimes.Ourschool_________(hold)theSin

Our school_________(hold) the Sino-US exchange culture activity several times.
Our school_________(hold) the Sino-US exchange culture activity several times.

Our school_________(hold) the Sino-US exchange culture activity several times.
several time 是现在完成式的标志,has held