答案都是B
因为主语是,I can't be sure 我不能确准,no one can be sure没有人确切地知道,都是不确切的知道,后面的宾语内容是否准确,因此后面的宾语其实是一个问句,而不是一个肯定句,问句的连接词不能用that,而要：一般疑问句用whether,特殊疑问句用特殊疑问词（what/when/which/why/how）,所以that引导的答案都是错的
初三英语从句问题1、I can't be sure ( ) they will agree to such a plan
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