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
Weather ______, the picnic will be held as scheduled.
A．permits
B．should permit
C．will permit
D．permitting
单项选择题
He had his leg ______ when he slipped on a piece of ice.
A．breaking
B．broken
C．to break
D．break
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