单项选择题

______, Wilson went to school on time.

A．By a rule
B．For a rule
C．As a rule
D．As the rule
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单项选择题
These machines ______ on sale the day after tomorrow.
A．are being put
B．are to put
C．will put
D．are to be put
单项选择题
Water power stations are built ______ there are big water falls.
A．in which
B．that
C．in that
D．where
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