题目：
The young scientist has made such great achievements in his chosen field ______ nobody else can make.
A．that
B．what
C．which
D．as
答案：
答案：D
考察定语从句。定语从句中使用关系代词as的时候，先行词前面必须有such, the same, as many, as much等修饰。本题的先行词achievement前面有such修饰，故使用as，as在句中作为make的宾语。
