单项选择题


A．priceless
B．valuable
C．invaluable
D．unrewarding
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单项选择题
A．themselvesB．himselfC．herselfD．ourselves
A．themselves
B．himself
C．herself
D．ourselves
单项选择题
A．spendB．costC．compensateD．reward
A．spend
B．cost
C．compensate
D．reward
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