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题目内容
（国家开放大学开放英语）
Cycling is a good exercise. ____, it doesn’t pollute the air.
单选题 (2 分) 2分
A.
Therefore
B.
Moreover
C.
But
D.
However
单选题 (2 分) 2分
A.
Therefore
B.
Moreover
C.
But
D.
However
参考答案
