单项选择题


A．extensive
B．enormous
C．overall
D．entire
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单项选择题
A．uponB．forC．asD．to
A．upon
B．for
C．as
D．to
单项选择题
It is a common theme in many science fiction stories that the world may one day be ______ by insects.
A．broken in
B．run over
C．taken over
D．filled in
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