问题
选择题
They have to walk_________8 country parks and___________20 hills and mountains. [ ]
A. up; up
B. over; over
C. through; over
D. along; down
答案
答案：C
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They have to walk_________8 country parks and___________20 hills and mountains. [ ]
A. up; up
B. over; over
C. through; over
D. along; down
答案：C