There is no doubt the boxes were then put on a train for Konigsberg was at that time a Ge

问题补充：

There is no doubt the boxes were then put on a train for Konigsberg, was at that time a German city on the Baltic Sea.

A. whether, which

B. that, where

C. that, that

D. that, which

答案：

A. whether, which

B. that, where

C. that, that

(答案→)D. that, which

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