单项选择题

A．He is not to blame.
B．He was responsible for the accident.
C．He will take all the responsibility.
D．He will be more careful next time.
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单项选择题
A．Hospital employees.B．City Hall officials.C．Packer Hall residents.D．The engineering students.
A．Hospital employees.
B．City Hall officials.
C．Packer Hall residents.
D．The engineering students.
填空题
Scientists use ______ to test whether their genetic modification of a plant is successful.
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