we----(do) lot of activities since we ----(come)to school six years ago

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we----(do) lot of activities since we ----(come)to school six years ago

we----(do) lot of activities since we ----(come)to school six years ago
we----(do) lot of activities since we ----(come)to school six years ago

we----(do) lot of activities since we ----(come)to school six years ago
we have done(do) lot of activities since we came(come)to school six years ago
since+过去时,主句用现在完成时

have done
came
祝你开心。

has done came