作业帮英语达人请进（请解释这个句子中的重要语法点）Therefore they would have been more likely, had they not switched courses,to cease attending lectures than those who did not switch.
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英语达人请进（请解释这个句子中的重要语法点）Therefore they would have been more likely, had they not switched courses,to cease attending lectures than those who did not switch.
英语达人请进（请解释这个句子中的重要语法点）
Therefore they would have been more likely, had they not switched courses,
to cease attending lectures than those who did not switch.
英语达人请进（请解释这个句子中的重要语法点）Therefore they would have been more likely, had they not switched courses,to cease attending lectures than those who did not switch.
这样翻译比较容易理解语法结构：
因此,如果没有转换过课程,(相对于那些没有转换课程的同学而言)他们更加可能中断参加课程.
所以主句是They would have been more likely to cease attending lectures.这是一个由情态动词Would引导的虚拟语气,其中又嵌套了现在完成时态have been.主句中重点的词组为 be likely to do sth.
had they not switched courses 在这里是条件状语从句,用于加强对主句行为的描述.这个从句本身是过去完成时态,同时将had前置强调虚拟语气（因为“他们没有转换课程”这一行为在过去已经发生过了）
Therefore 因此，副词
剩下的句子调整一下顺序，把两个逗号中的分句放到最前面，就变成：
had they not switched courses,they would have been more likely to cease attending lectures than those who did not switch.
其中，
had they n...
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Therefore 因此，副词
剩下的句子调整一下顺序，把两个逗号中的分句放到最前面，就变成：
had they not switched courses,they would have been more likely to cease attending lectures than those who did not switch.
其中，
had they not switched courses使用了虚拟语气的倒装形式，正常语序是：
if they had not switched courses
其实是一个if引导的条件状语；
they would have been more likely to cease attending lectures than those who did not switch的主要结构是 be likely to do sth.
加上了比较级就变成 A be more likely to do sth. than B
who did not switch是一个who引导的定语从句，修饰前面的whose
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这样来说，他们更可能比那些没有转换课程的同学停止参加课程。
Therefore they would have been more likely, 原因状语从句had they not switched courses,主句
to cease attending lectures than those who did not switch.停止参加课。。。紧跟主句做补语。