请问It was not until the 1990s,when Mr.Wang was already in his forties,_It was not until the 1990s,when Mr.Wang was already in his forties,___he began to teach himself English.A before B when C since D that

请问It was not until the 1990s,when Mr.Wang was already in his forties,_It was not until the 1990s,when Mr.Wang was already in his forties,___he began to teach himself English.A before B when C since D that
请问It was not until the 1990s,when Mr.Wang was already in his forties,_
It was not until the 1990s,when Mr.Wang was already in his forties,___he began to teach himself English.
A before B when C since D that

请问It was not until the 1990s,when Mr.Wang was already in his forties,_It was not until the 1990s,when Mr.Wang was already in his forties,___he began to teach himself English.A before B when C since D that
选择：D that
解析
一、句子总体分析
主句 It was not until the 1990s ___ he began to teach himself English
插入性时间状语从句：when Mr. Wang was already in his forties
二、所表达意思与句子结构分析
1、主句的意思是“直到上世纪九十年代他才开始自学英语”.
2、各种不同的表述手段——
* 正常语序：He didn’t begin to teach himself English until the 1990s.
* 倒装句：Not until the 1990s did he begin to teach himself English.
* 强调句：It was not until the 1990s that he began to teach himself English.
——其结构为： it（强调代词）+ be + 强调部分 + 助动词 + 主语 + 谓语动词 +其他部分
* 其他手段：It was in the 1990s when/before he began to teach himself English.
——其结构为：
主句：It was in the 1990s ——it 在这里是非人称代词,用来指代时间
从句：when/before he began to teach himself English.

结论：选择 A befor e和 B when 与原题结构有出入；C since 不能表示这种意思.

A

D
It was not until .....that......句型。

armouomo 正解？？？？什么意思？…………我是说一楼的那个人armouomo的答案正确 另外，你上面追问“不是说that前无逗号的吗” 先看看句子 It was not until the 1990s,when Mr.Wang was already in his forties, that he began to teach himself English. 中间有句when M...

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正确答案是D，，，强调句It is/was+被强调部分+that+句子其他成分。
when Mr.Wang was already in his forties是干扰项，可以不管

D，It was+强调的时间（not until the 1990s)，（时间状语），+that从句

D
it is....that.....强调句句型。