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The human beings should preserve the buildings of the past to visit them for enjoyment and learn ______ life was like when they were first built．
The human beings should preserve the buildings of the past to visit them for enjoyment and learn ______ life was like when they were first built．
A．how B．that C．which D．what
A.
B.how
C.that
D.which
B.how
C.that
D.which
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