问题
选择题
30. Only those who have experienced hardship ____ well aware of what happiness means.
A．can they be
B．they can be
C．can be
D．they can
答案
答案：C
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30. Only those who have experienced hardship ____ well aware of what happiness means.
A．can they be
B．they can be
C．can be
D．they can
答案：C