relationship with A；relationship between A and B
A‘s relationship and B's relationship; the relationship of A and B指的是A的关系和B的关系，是并列关系，不表示A与B之间的关系
本题的意思是：在美国，一群历史悠久的黑人大学联合起来，利用这些学校与非洲国家传统上密切的关系，将非洲问题整合到国际商务研究中。
and的平行结构，可以排除ABC
D remain this way就表示维持这个样子，remain in this way 是wordy，因为 remain this way === do in this way.
* I wake up every morning on 5:00 am, she has been remaining this way for three months.
* I wake up every moring on 5:00 am, she has been doing in this way for three months.
THUS can refer to certain things depending on the situation. 'Thus' can refer to some process that is stated earlier in some cases or it can refer to the 'state' that is mentioned in the statement.
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but前后时态应保持一致；eager to do；
积累：一个句子使用Instead强调要做的是后面内容，使用Instead of强调要做的的是前面的内容（instead of的内容是实际上不会发生、不会做的，表达的是一种否定语气）。
简单说：Instead表达“而是要”，Instead of表达“而不是”