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It’s not easy to change habits,________ with awareness and self­control,it is possible.                                                              (2013·重庆,23)
A.forB.or
C.butD.so
C
解析  考查连词。句意为:改变习惯不容易,但是如果有了想改变的意识和自控力,(改变习惯)也是可能的。前后句之间为转折关系,故选C项。
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