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21、 ________ the trade between the two countries reached its highest point.

A. During the 1980s when                    B. That it was in the 1980s

C. It was in the 1980s that                     D. It was in the 1980s when

 

 

21、C

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 ________ the trade between the two countries reached its highest point.

A. During the 1980s when                    B. That it was in the 1980s

C. It was in the 1980s that                     D. It was in the 1980s when

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