单项选择题


A．stopped
B．prevented
C．infected
D．cured
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单项选择题
A．seldomB．rarelyC．usuallyD．hardly
A．seldom
B．rarely
C．usually
D．hardly
单项选择题
A．themselvesB．himselfC．someoneD．oneself
A．themselves
B．himself
C．someone
D．oneself
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