用适当形式填空：half an hour____(pas)since the train____(leave)最好解释清楚原因

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用适当形式填空：half an hour____(pas)since the train____(leave)最好解释清楚原因
用适当形式填空：half an hour____(pas)since the train____(leave)
最好解释清楚原因

用适当形式填空：half an hour____(pas)since the train____(leave)最好解释清楚原因
has passed
left

has passed
left

has passed
left
since 从句后面用一般过去时 前面主句用现在完成时
祝你学习进步为什么不用had呢？非得用现在完成时而不是用过去完成时it is / has been +一段时间+since +一般过去时 这是故固定用法的句型 是指从过去某一个动作（即since 后面从句的动作）发生后，到现在所经历的时间， 而不是过去的过去，所以不能用h...

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has passed
left
since 从句后面用一般过去时 前面主句用现在完成时
祝你学习进步

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填has passed和left。
句意：火车开走已半个小时了。

half an hour has passed since the train___left (leave)
自从火车离开已经过去半小时了，前面用完成式，后面是一段时间.

has passed ， left
考点：Since引导时间状语下的现在完成时态用法。

has passed; left
车已经开过半个小时了。

第一空 had passed 原因， 后面是since 的内容是过去的过去 所以用过去完成
第二空 left 因为leave 离开的意思，是短暂性动词，不能用过去完成时，只能用一般过去时

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