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
So little ______ about chemistry that the lecture was completely beyond me.
A．did I know
B．I know
C．do I know
D．I knew
单项选择题
______ , Gloria started looking for work.
A．All the money being spent
B．All the money having been spent
C．All the money spend
D．Spending all the money
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