单项选择题

During the past ten years there have been dramatic changes in the international situation.

A．permanent
B．powerful
C．striking
D．practical
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单项选择题
I meant to give you this book today, but I forgot.
A．intended to
B．tended to
C．extended to
D．pretended to
单项选择题
The most crucial problem any economic system faces is how to use its scarce resources.
A．puzzling
B．difficult
C．terrifying
D．urgent
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