单项选择题

______ , the ship's captain changed course.

A．To be warned
B．To have been warned
C．Having been warned
D．Being warned
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单项选择题
Because of bad weather the plane was ______ for half an hour.
A．prolonged
B．delayed
C．postponed
D．put off
单项选择题
It has been cold this month, but today is a(n) ______ ; it's warm and sunny.
A．abolition
B．subtraction
C．elimination
D．exception
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