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
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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

英语 用所给单词的适当形式填空.The meeting ------- （begin) in half an hour. They spent half an hour (pack)their bags 用适当形式填空 过去完成时 They spent half an hour (pack)their bags 用适当形式填空 过去完成时 his father usually___(relax) half an hour after supper.用所给词的适当形式填空 Mr Smith ___(go) home.He left half an hour ago用所给动词的适当形式填空 you have missed the train ,it ____(leave)half an hour ago用动词的适当形式填空可不可以用has left 用所给动词的适当形式填空She _______(not clean) her room.She _______ (clean) it in half an hour. when _____the film ____(begin?it began half an hour ago,用所给词适当形式填空,还要说为什么那样选择. 【用括号内所给动词的适当形式填空】Half an hour later ,she -----（meet）her husband outside the park I'll be able to finish this essay ___(easy） in half an hour .（适当的形式填空） they usually _____(run) for half an hour every morning用适当形式天空 应该用 run 还是running 为什么 英语：用动词的适当形式填空：He ____(do) his homework in an hour.为什么? it takes my brother an hour……(finish) his homework.(用适当的形式填空) 用适当形式填空：half an hour____(pas)since the train____(leave)最好解释清楚原因 I spend half an hour _(watch) TV every night.用所给词的真确形式填空为什么 1.Let the boy____(come)in,please.2.The girl pra1.Let the boy____(come)in,please.2.The girl practices____(read)English for half an hour every day.用所给单词的适当形式填空 It takes him half an hour ____(watch)CCTV new every day We ____(not see)each other for a long time用括号中的词的适当形式填空 用所给动词的适当形式填空1、What ________ you ________ ( do ) these days?2、They kept me _______ ( wait ) outside the school for nearly half an hour.3、There is a girl ______ ( wait ) outside the classroom.