单项选择题

This will improve their working conditions and enable them to double the______.

A. goods
B. quantity
C. output
D. product
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Mary had an ______; she' s been knocked down by a taxi.
A. event
B. occurrence
C. accident
D. incident
单项选择题
When the head nurse ______, you'll know when you ______ for New York.
A. arrives, leaves

B. will arrive, leaves
C. arrives, leave

D. will arrive, will leave
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