She programs us with all the possible moves she has seen while watching human games."she has seen "为什么要用现在完成时?

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She programs us with all the possible moves she has seen while watching human games."she has seen "为什么要用现在完成时?
She programs us with all the possible moves she has seen while watching human games.
"she has seen "为什么要用现在完成时?

She programs us with all the possible moves she has seen while watching human games."she has seen "为什么要用现在完成时?
过去完成时·see 是在program之前完成的动作或者说状态.

seen已经是过去式了,如果把has换成had,那这就成了已经过去式的句子了,可是这个句子是过去式。she是第3人称,所以后面要放has而不是。have只有4种形态,have,has,had和having。这个句子不是现在进行式,不可能放having。所以应该是has.