单项选择题

The soldier ______ great courage in saving the child from the river.

A．explained
B．illustrated
C．demonstrated
D．indicated
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单项选择题
The police officer thoroughly ______ the cause of the accident, but they couldn't find any trace.
A．explored
B．examined
C．investigated
D．analyzed
单项选择题
Becoming disabled by an accident is one of the most serious ______ that all drivers face.
A．faults
B．mistakes
C．hazards
D．shortcomings
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