单项选择题

Only by listening, speaking, reading and writing ______.

A．can English be mastered
B．can we master English
C．English can be mastered
D．we can master English
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单项选择题
______, I'll marry him all the same.
A．Was he rich or poor
B．Whether rich or poor
C．Were he rich or poor
D．Be he rich or poor
单项选择题
______ orbits the Sun, Uranus rotates on its axis, an imaginary line through its center.
A．For it
B．It
C．As it
D．There it
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