单项选择题

The two countries were fighting severely to ______ every inch of the land,

A．intervene
B．contest
C．imperil
D．inhabit
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单项选择题
To write a summary effectively, you will need to ______ words for phrases, and phrases for sentences.
A．convert
B．complement
C．substitute
D．design
单项选择题
The best solution to the problem can only be found by a process of trial and ______.
A．error
B．mistake
C．success
D．experiment
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