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HE ran back into his room to see if he~anything behing.

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HE ran back into his room to see if he~anything behing.
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为什么
HE ran back into his room to see if he~anything behing.
这个动作有先后性,他先是东西放在了屋里,然后跑出去的,所以用过去时,为了表示状态已经发生,用的过去完成时.这个放东西的动作发生在出去之前,所以放东西是过去完成时,而跑用的是过去时.