(2013·重慶，23)It's not easy to change habits，________ with awareness and self－control，it is possible.
A．forB．orC．butD．so
C
考查并列連詞。句意：改變習(xí)慣不易，但如果是有意識和有自我控制能力的話，還是有可能的。前后為轉(zhuǎn)折關(guān)系，用并列連詞but。
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