单项选择题

All the schools ______ because of the earthquake, students and teachers had to go back home.

A. having destroyed
B. were destroyed
C. having been destroyed
D. have been destroyed
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单项选择题
Which factor does first aid not usually include
A．Telling where the nearest hospital is.
B．Telephoning a friend or relative.
C．Finding out the cause of the accident.
D．Summoning an ambulanc
单项选择题
Which statement is true about first aid
A．It usually makes the services of a doctor unnecessary.
B．It is usually done by someone who is not a doctor.
C．It is usually done by a doctor.
D．It is usually done by the victim himsel
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