he lost his k______ .he can't open the door.

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he lost his k______ .he can't open the door.
he lost his k______ .he can't open the door.

he lost his k______ .he can't open the door.
key
他掉了钥匙 所以他开不了门

key

keys.应为复数

key 因为后面是the door

key.
单数即可。

1 key
2 basketball或ball