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题目内容
（国家开放大学理工英语）
The walls function like a dam to keep the water _____ and the structure lies naturally within its surroundings, remaining invisible from a distance.
单选题 (10 分) 10分
A.
of
B.
out
C.
in
单选题 (10 分) 10分
A.
of
B.
out
C.
in
参考答案
