单项选择题

A．build
B．have built
C．building
D．built
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单项选择题
A．durablyB．durableC．durabilityD．duration
A．durably
B．durable
C．durability
D．duration
单项选择题
A．particularB．particularityC．particularsD．particularly
A．particular
B．particularity
C．particulars
D．particularly
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