______that the partnership between the two countries reached its highest point.
A、
During the 1990s
B、
It was the 1990s
C、
That it was in the 1990s
D、
It was in the 1990s
【正确答案】
D
【答案解析】
解析:句意:在20世纪90年代,两国的合作关系达到顶点。该句为强调句,结构为“It+be动词+…that…”,“20世纪90年代”是时间状语,需连接介词in。故选D。
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