单项选择题

I don't think it is any use _________ this matter any further.

A．discussing
B．to discuss
C．to discussing
D．to be discussed
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单项选择题
You will never guess whom I _________ on the street yesterday.
A．ran over
B．ran out of
C．ran into
D．ran up to
单项选择题
At first the institute refused to purchase the telescope, but this decision was _________ revised.
A．occasionally
B．consequently
C．successively
D．subsequently
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