Which question word best completes the paragraph below? ...

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Q691520 Inglês

Which question word best completes the paragraph below?

So if smoking is so bad for you, ______ is it so hard to quit? Stopping smoking is difficult for several reasons: nicotine is highly addictive, rewarding psychological aspects of smoking and genetic predisposition.

(Adapted from http://www.spine-health,com/wellness/stop-smoking)

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