单项选择题

PO to be understood B) understanding C) to understand D) being understood

A．PO to be understood B) understanding
B．to understand
C．being understood
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单项选择题
A．byB．forC．overD．against
A．by
B．for
C．over
D．against
单项选择题
A．There areB．They areC．These areD．Those are
A．There are
B．They are
C．These are
D．Those are
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