Question

It was the training that he had as a young man _____ led to his success. A that B it C who D which

求解析

Answer 1

第一个that并不是强调句的that,而是定语从句里的，即：training that he had

第二个that，也就是选项A，才是强调句中的that.

Answer 2

the training that he had 中的 that he had 是作为定语从句存在的。
as a young man 是状语，表示状态。
整个句式是一个强调句，总句的意思是是他在年轻的时候收到的训练让他获得了成功，强调训练，强调句式用that，所以第二个空也是that
答案为A

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Answer 3

选D 定于从句 先行词是training， which指代training
A that 不可选 因为前必须有逗号
Bit 不可选 因为它不能引导定从
C who 不可选 因为其先行词为人

追问

为什么that 前面一定要有逗号呢？