-Bobhaschangedalot!-That'strue．Thatfactisthathe'sfivekilossincehegaveupsmoking．（）A.putupB.putoffC.putonD.putdown
-Bob has changed a lot!
-That's true．That fact is that he's___________ five kilos since he gave up smoking．（ ）
A. put up
B. put off
C. put on
D. put down
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