【題目】It's not easy to change habits, ______ with awareness and self-control, it is possible.
A.for
B.or
C.but
D.so

【答案】C
【解析】句意：改變習慣不容易，但如果是有意識且有自控力，就可能做到。空處前面說的是不容易，后面說的是可能，顯然是轉折關系。

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