单项选择题

Red and Black ______ full of well-chosen words.

A．are
B．have
C．were
D．is
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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
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
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