单项选择题

They agreed to modify their policy.

A．clarify
B．define
C．change
D．develop
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单项选择题
Enormous sums of money have been spent on space exploration.
A．Much
B．Large
C．Small
D．Fixed
单项选择题
This table is strong and durable.
A．long-lasting
B．extensive
C．far-reaching
D．eternal
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