单项选择题

John plays football______, if not better than David.

A．as well
B．as well as
C．so well as
D．so well
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单项选择题
Excuse me for breaking in ,______I have some news for you.
A．so
B．and
C．but
D．yet
单项选择题
The research is so designed that once ______nothing can be done to change it.
A．begins
B．having begun
C．beginning
D．begun
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