The two men are well ______ with each other since they once studied in the same university.
 
【正确答案】 B
【答案解析】 固定搭配。be acquainted with表示“与……相识，熟悉”。句意为：这两个男人彼此很熟悉，因为他们曾在同一所大学求学，故答案为B。