It’s not easy to change habits，________ with awareness and self­control，it is possible.                                                              (2013·重慶，23)
A．forB．or
C．butD．so
C
解析　 考查連詞。句意為：改變習(xí)慣不容易，但是如果有了想改變的意識(shí)和自控力，(改變習(xí)慣)也是可能的。前后句之間為轉(zhuǎn)折關(guān)系，故選C項(xiàng)。
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