what is it which makes a scientific achicevement important?为什么要把WHICH改成THAT?
问题描述：
what is it which makes a scientific achicevement important?为什么要把WHICH改成THAT?
答
这是典型的‘强调句式“,永远都不可以用 that-/ who-/whom- 以外的连接词.
只有一种例外,被强调的是人时,可以用who/whom,除此以外,一律用 that-
或者说,在任何情况下用 that- 都安全,都绝对正确：事物、人、地点、时间、方式、原因、从句……
It was Tom who/ whom/ that I met in the street last Sunday.