单项选择题

He will tell us why he feels so strong that each of us has a role______in malting the earth a better place to live on.

A．to have played
B．to play
C．to be played
D．to be playing
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单项选择题
It was in that year ______ the American astronauts succeeded______landing on the moon.
A．when, on
B．that, on
C．when, in
D．that, in
单项选择题
The old woman is still in danger. She is______than she was yesterday.
A．as well as
B．not worse
C．no better
D．more worse
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