单项选择题

Last week he promised that he （） today, but he hasn't arrived yet.

A．will come
B．would come
C．would have come
D．is coming

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I don' t swim now, but I （） when I was a kid.

A．used to it
B．used to
C．used to doing it
D．used to do
单项选择题
To succeed in a scientific research project, （）.

A．persistence is what one needs
B．persistence is needed
C．one needs be persistent
D．one needs to be persistent
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