.It was in the 1990s we were working together we made friends with each other.A. that; w

问题补充：

.It was in the 1990s we were working together we made friends with each other.

A. that; when

B. when; that

C. that; that

D. when; when

答案：

A. that; when

(答案→)B. when; that

C. that; that

D. when; when

解析：考查含有定语从句的强调句型。第一空是定语从句，先行词为the 1990s，从句中缺少时间状语，所以用when，第二空，用that 为强调句型的标志，句意:就是在二十世纪九十年代我们一起工作的时候我们互相交了朋友。所以选B。