saw a boat _____(appear) on the lake and then moving towards me.适当形式填空,理由

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sawaboat_____(appear)onthelakeandthenmovingtowardsme.适当形式填空,理由sawaboat_____(appear)onthelakeandthenm

saw a boat _____(appear) on the lake and then moving towards me.适当形式填空,理由
saw a boat _____(appear) on the lake and then moving towards me.
适当形式填空,理由

saw a boat _____(appear) on the lake and then moving towards me.适当形式填空,理由
appearing
see sb/sth do/doing sth 固定搭配
且此处appearing与moving并列,形式要相同