Look!The students______(skate)for charity.Some of them _______ (skate) for m

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Look!The students______(skate)for charity.Some of them _______ (skate) for m
Look!The students______(skate)for charity.Some of them _______ (skate) for m

Look!The students______(skate)for charity.Some of them _______ (skate) for m
are skating,have been skating

句子不全么? are skating, have skated

不知道你想问什么。估计是第一个空格填are skating,第二个空格因为不完整没法填。可能性很多。