问题
选择题
Mary actually saw lung cancer kill her father，who had smoked ________ since he was a teenager.
[ ]
A．badly
B．seriously
C．heavily
D．fiercely
答案
答案：C
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Mary actually saw lung cancer kill her father，who had smoked ________ since he was a teenager.
[ ]
A．badly
B．seriously
C．heavily
D．fiercely
答案：C