单项选择题

A．looked
B．viewed
C．received
D．perceived
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单项选择题
A．althoughB．lestC．unlessD．since
A．although
B．lest
C．unless
D．since
单项选择题
A．costsB．expensesC．interestsD．investments
A．costs
B．expenses
C．interests
D．investments
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