单项选择题


A．control
B．controllable
C．controlled
D．controlling
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单项选择题
A．butB．henceC．howeverD．whereas
A．but
B．hence
C．however
D．whereas
单项选择题
A．there isB．there areC．thatD．what
A．there is
B．there are
C．that
D．what
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