单项选择题


A．constructed
B．based
C．found
D．depend
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单项选择题
A．whateverB．wheneverC．howeverD．wherever
A．whatever
B．whenever
C．however
D．wherever
单项选择题
Many houses in the north are warm in winter because they are ______ so that the heat is not lost.
A．insulated
B．insulted
C．imitated
D．initiated
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