求这句英文句子的语法错误在哪里?those who wish to be a musician should bear in mind that much practice is required and that a great deal of it is decidedly unexciting补充，这个句子只有一个语法错误。我刚开始觉得 those和 a musician 一个单一个复，不行但是后面的that又很奇怪
问题描述：
求这句英文句子的语法错误在哪里?
those who wish to be a musician should bear in mind that much practice is required and that a great deal of it is decidedly unexciting
补充，这个句子只有一个语法错误。
我刚开始觉得 those和 a musician 一个单一个复，不行
但是后面的that又很奇怪
答
我想是最后一个单词有问题吧。unexpected？
答
第二个that应去掉，重复了
答
those和 a musician矛盾，that是引导宾语从句的，不充当成分。
ps:两个并列的宾语从句时,第一个从句中的that可以省,第二个从句中的that不能省
答
those是复数，a musician是单数
答
those who 跟复数``
bear in mind 后面是 并列的宾语从句,由and或but所连接的两个引导的宾语从句时,第一个从句中的that可以省,第二个从句中的that不能省；