Question

With time going by,China is not___it used to be

With time going by,China is not___it used to be thirty years ago.
A.that B.what C.which D.when
为什么？

Answer 1

With time going by, China is not (what) it used to be thirty years ago.
随着时间的推移，中国已不再是三十年前的中国。

这里what引导的是一个名词从句, what在句中作it used to be的表语

Answer 2

B

Answer 3

B. China is not WHAT it used to be thirty years ago.

Answer 4

be后面缺宾语用What

Answer 5

B
在这儿what引导一个表语从句。译作：中国已不再是三十年前的中国。
同义句有：
With time going by,China is not the same country as it used to be thirty years ago.
With time going by,China is not the same as it used to be thirty years ago.
With time going by,China is not the country that it used to be thirty years ago.