问题补充：
The research group 15 members has made great achievements in recent years.
A. is made up of
B. makes up
C. made up of
D. making up of
答案：
A. is made up of
B. makes up
(答案→)C. made up of
D. making up of
解析：考察定语用法。本题的关键是分清句中结构，本句的谓语动词是has made great achievements in recent years.前面的形容词短语made up of 15 members是对名词The research group进行修饰限制。相当于which is made up of 15 members.句意：由15个成员组成的研究队伍，在最近几年里已经取得了巨大的成就。故C正确。
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