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
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
单项选择题
______my neighbor’s kid with his coming exam，I spend an hour working with him every day.
A．To help
B．Helping
C．Helped
D．Having helped
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