It was in the 1990s _______ we were working together ____ we made friends with each otherA.that; whenB.when; thatC.that; thatD.when; when
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B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。