A、In 1977, the total sum of Chinese imports and exports was less than $15 billion, put Ch
B、In 1977, the sum total of Chinese imports and exports was less than $15 billion, puttin
C、In 1977, the sum total of Chinese imports and exports was less than $150 billion, putti
D、In 1977, the total sum of Chinese imports and exports was less than $150 billion, putti
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