单项选择题
A．debt
B．danger
C．need
D．trouble
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单项选择题
A．doseB．drugC．prescriptionD．herb
A．dose
B．drug
C．prescription
D．herb
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单项选择题
A．regularlyB．seldomC．infrequentlyD．occasionally
A．regularly
B．seldom
C．infrequently
D．occasionally
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