单项选择题

There is such a rapid increase in the number of private cars as to ______ a gas shortage.

A．causing
B．cause
C．caused
D．being caused
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单项选择题
Red and Black ______ full of well-chosen words.
A．are
B．have
C．were
D．is
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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