单项选择题

She doesn't know ______ she should go with him.

A) if or not
B) whether or not
C) if not
D) whether not
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单项选择题
The purpose of Magellan’s expedition was ______.
A．to become famous at that time
B．to find navigation line from the Atlantic to the Pacific
C．to make a voyage to Asia
D．to carry men to the Seville
单项选择题
How often are letters delivered to the family’s door
A．all day long
B．every day
C．every other day
D．on Sunday
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