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Though he is ill, he has not quit _____.
A. smoke B. to smoke C. smoked D. smoking
Though he is ill, he has not quit ________．
A．smoke
B．to smoke
C．smoked
D．smoking
（2010·江苏如东高级中学高三国庆假期自主练习一） 4. Though he is ill, he has not quit ___________.