She _____(can)skate when she was only four.

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She _____(can)skate when she was only four.
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She _____(can)skate when she was only four.
She _____(can)skate when she was only four.

She _____(can)skate when she was only four.
could 用can 的过去式

could when后从句为过去完成时,所以主句谓语动词用过去分词(主过从过)

could;原因:后面when she was only four可以知道用过去式