单项选择题

A．whether
B．that
C．how
D．because
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单项选择题
A．thatB．whichC．whatD．all
A．that
B．which
C．what
D．all
单项选择题
What is the main topic of the lecture
A．Bicycles and cars.
B．Building codes.
C．New housing construction.
D．Energy conservation.
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