单项选择题


A．to study
B．studying
C．studied
D．being studied
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单项选择题
A．whichB．thatC．theyD．what
A．which
B．that
C．they
D．what
单项选择题
A．atB．onC．withD．in
A．at
B．on
C．with
D．in
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