go __throuhgt______ the door on the left and close it behind

through为在立体空间中的“穿过”.如：go through the forest“穿过森林”
across为“横穿”,与“道路”交叉形成“十字”.如：go across the street “穿过大街”.
更细一点说,across表示从物体表面“穿过”、“通过”;而through则表示从内部“穿过”、“通过”.
再举两个例子：They swam across the river.他们游过河去.
They walked through the forest.他们走过森林.
希望能帮上你哦~

go __though______ the door on the left and close it behind you
=across the door on the left and close it behind you
前面的go是动词，那么后面无法继续是动词across，而是介词though.
❤您的问题已经被解答~~(>^ω^<)喵
如果采纳的话，我是很开心的哟(～ o ～)~zZ

across 是横穿,如过马路,用across
through是直通过,门是走走进去,所以用through
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through ,从中间穿过，across是从表面穿过

过马路用go across，因为人行道的空间大，而且过马路不止一条路
过一扇门用go through， 因为空间狭小，你只能过这扇门，别无选择。

across 当穿过将时，是平面上穿过
through 当穿过将时，是立体空间穿过