Look!Who____(climb)up the tree?____处填什么?

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Look!Who____(climb)up the tree?____处填什么?
Look!Who____(climb)up the tree?____处填什么?

Look!Who____(climb)up the tree?____处填什么?
is climbing

应该填is climbing, 因为Who是第三人称单数所以用is ,有look 表示正在进行的动作,所以用进行时