单项选择题

A．He is afraid he won’t be chosen.
B．The boss hasn’t decided where to go.
C．Such a trip is necessary for the company.
D．It’s not sure whether there is a trip.
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单项选择题
If there are no boxes or baskets, the letters are ______.
A．returned to the sender
B．directly handed over to the receiver
C．put into the mailbag
D．pushed through an opening in the door
填空题
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