单项选择题

A．to try
B．trying
C．to be tried
D．to be trying
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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．Because be reads too many books.B．To learn how to separate the important from the unimportant.C．To be well-informed.D．Because he always wastes his time.
A．Because be reads too many books.
B．To learn how to separate the important from the unimportant.
C．To be well-informed.
D．Because he always wastes his time.
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