单项选择题

Excuse me for breaking in ,______I have some news for you.

A．so
B．and
C．but
D．yet
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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
单项选择题
______ such heavy pollution already ,it may now be too late to clean up the river.
A．Having suffered
B．Suffering
C．To suffer
D．Suffered
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