单项选择题

Cuts in funding have meant that equipment has been kept in service long after it （） replaced.

A．should have been
B．would have been
C．could have been
D．might have been

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单项选择题
You （） engage in serious debate or discussion unless you are willing to endure attacks.

A．have better not
B．had better not
C．have better not to
D．had better not to
单项选择题
When I worked as a bank clerk, I had the opportunity to meet a rich （） of people: students, soldiers and factory workers.

A．diversity
B．kind
C．range
D．variety
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