(By the 1980s) more than (two-fifth of) U.S. crop production was exported, (making) U.S. agriculture heavily (dependent) upon in

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问题 (By the 1980s) more than (two-fifth of) U.S. crop production was exported, (making) U.S. agriculture heavily (dependent) upon international markets.

选项 A、By the 1980s
B、two-fifth of
C、making
D、dependent

答案B

解析
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