单项选择题

The UN team returned to the capital of Congo because ______.

A．they are investigating the President
B．they would join a demonstration
C．the situation was insecure
D．they helped Rwandan refugees
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单项选择题
How often does the APEC hold its meeting
A．Once a month.
B．Once a year.
C．Every 10 years.
D．Every Sunday.
单项选择题
Large sums of money are needed for the development of all the following EXCEPT ______
A．housing
B．airports
C．water supplies
D．roads
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