Though ____ the dangers of smoking to th
题型：选择题
问题：
Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.
A．aware
B．aware of
C．are aware of
D．be aware of
题型：选择题
Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.
A．aware
B．aware of
C．are aware of
D．be aware of
