【单选题】Educational expenses are tax-deductible ______ the taxpayer can show that these expenses enhanced his or her professional skills or expertise.
A．only if
B．as if
C．as many as
D．as much as
【单选题】Educational expenses are tax-deductible ______ the taxpayer can show that these expenses enhanced his or her professional skills or expertise.
A．only if
B．as if
C．as many as
D．as much as
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