单项选择题

On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading "Boston".

A．which
B．where
C．when
D．that
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单项选择题
The roles expected ______ old people in such a setting give too few psychological satisfactions for normal happiness.
A．of
B．on
C．to
D．with
单项选择题
Doctors see a connection between increased amounts of leisure time spent ______ and the increased number of cases of skin cancer.
A．to sunbathe
B．to have sunbathed
C．having sunbathed
D．sunbathing
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