In 1960s, people living along the River failed to keep natural balance of the area. ——青夏教育精英家教网—

摘要： In 1960s, people living along the River failed to keep natural balance of the area. A. /; the B. the; a C. the; the D. /; a

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In _____ 1960s, people living along the River failed to keep _______ natural balance of the area.

A. /; the B. the; a C. the; the D. /; a

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