单项选择题

A．concentrate on
B．focus on
C．rely on
D．center around
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单项选择题
A．Building an office complex.B．Building a clubhouse.C．Building a private residence.D．Building an apartment house.
A．Building an office complex.
B．Building a clubhouse.
C．Building a private residence.
D．Building an apartment house.
单项选择题
A．WhatB．WhereC．WhileD．How
A．What
B．Where
C．While
D．How
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