单项选择题

Only when you have obtained sufficient data ______ come to a sound conclusion.

A．can you
B．would you
C．you will
D．you can
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单项选择题
The President made his last public ______ before his term of office ended.
A．appearance
B．engagement
C．gathering
D．meeting
单项选择题
A．toB．upC．above.D．on
A．to
B．up
C．above.
D．on
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