单项选择题

What does "to do so" (in Line 7, Para. 5) mean

A．To question popularity.
B．To have physical problems.
C．To predicts situational loneliness.
D．To make new friends.
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单项选择题
Lonely people have social contacts ______.
A．until they produce good health
B．because they can ask for help
C．but they think they do not have enough
D．and therefore they can get emotional support from their friends
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