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8、The Sino – U. S relations, though they have experienced ups and downs in the past,        

have moved forward, especially after its president, Barack Obama’s visit to China.

A．in return          B．in turn         C．on the whole          D．on the other hand

8、C

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The Sino – U. S relations, though they have experienced ups and downs in the past,        

have moved forward, especially after its president, Barack Obama’s visit to China.

A．in return          B．in turn         C．on the whole          D．on the other hand

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