The young scientist has made such great achievements in his chosen field ______ nobody else can make.
A.that
B.what
C.which
D.as
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D解析考察定语从句。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。