单项选择题

Dr. Hawking has made much contribution to the theories of modem physics at the （）of his health.

A．mercy
B．disposal
C．cost
D．expenditure

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单项选择题
The ATMs enable bank customers to access their money 24 hours a day and seven days a week （）ATMs are located.

A．whenever
B．wherever
C．however
D．whatever
单项选择题
A recent survey suggested that if money were not an issue, most mothers （）not to work at all.

A．would prefer
B．prefer
C．should prefer
D．preferred
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