单项选择题

We’’ve just installed two air-conditioners in our apartment, _______should make great differences in our life next summer.

A．which
B．what
C．that
D．they
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单项选择题
Land belongs to the city; there is ______thing as private ownership of land.
A．no such a
B．not such
C．not such a
D．no such
单项选择题
I______ this book in a secondhand bookstore on Nanjing Road.
A．came into
B．came about
C．came round
D．came across
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