单项选择题

The engine was ______ by a tree lying across the line.

A．degraded
B．detached
C．dismissed
D．derailed
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单项选择题
His ambition was to ______ his father and become a member of parliament.
A．copy
B．emulate
C．mimic
D．mime
单项选择题
The guard was punished for ______ his post.
A．deserting
B．asserting
C．preserving
D．reserving
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