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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单项选择题
Ever since he arrived, he （） constantly about the weather.

A．complained
B．has been complaining
C．is complaining
D．had been complaining
单项选择题
Weather （）, the picnic will be held as scheduled.

A．permits
B．should permit
C．will permit
D．permitting
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