that boy was able to swim well when he was four .（同义句） that boy __swim well when he was 4.

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thatboywasabletoswimwellwhenhewasfour.（同义句）thatboy__swimwellwhenhewas4.thatboywasabletoswimwellwhenh

that boy was able to swim well when he was four .（同义句） that boy __swim well when he was 4.
that boy was able to swim well when he was four .（同义句） that boy __swim well when he was 4.

that boy was able to swim well when he was four .（同义句） that boy __swim well when he was 4.
could
不明白的再问哟,请及时采纳,多谢!

could

could哦