John thinks it won’t be long ( ) he is ready for his new job

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John thinks it won’t be long ( ) he is ready for his new job.A before b since
John thinks it won’t be long ( ) he is ready for his new job.
A before
b since
为什么要选a,b为什么不可以

要搞清楚先后关系,句子要表达的意思是在“他准备好参加新工作”之前不会花费太久时间,这里是“之前”,所以用before,说白了就是他会很快做好参加新工作的准备；如果是since,意思就不对了,变成了“他准备好参加新工作”之后不会花费太长时间,说不通.

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