问题
选择题
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
答案
答案：C
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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
答案：C