单项选择题

A．keep
B．enable
C．avoid
D．suggest
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单项选择题
A．recorderB．registerC．machineD．teller
A．recorder
B．register
C．machine
D．teller
单项选择题
A．how oftenB．how muchC．how manyD．how
A．how often
B．how much
C．how many
D．how
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