单项选择题

According to the writer, insurance is ______.

A．useful but too risky
B．useful and necessary
C．costly but worth buying
D．cheap but not necessary
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单项选择题
I didn' t understand at first why he couldn' t pass the test, no matter ______ hard he had tried.
A．when
B．where
C．what
D．how
单项选择题
Tony is talking about the friends and the food ______ interest him.
A．which
B．who
C．that
D．as
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