It was after what seemed like a century we were allowed to go home.A. whenB. whichC. asD.

问题补充：

It was after what seemed like a century we were allowed to go home.

A. when

B. which

C. as

D. that

答案：

A. when

B. which

C. as

(答案→)D. that

解析：根据it was后面的介词短语after what seemed like a century可知，这是强调句型。强调的是时间状语。句意：似乎经过了一个世纪之后，我们才被允许回家。故选D。