单项选择题


A．that
B．which
C．those
D．what
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单项选择题
A．give upB．give awayC．give inD．what
A．give up
B．give away
C．give in
D．what
单项选择题
A．while studyB．for studyingC．studyingD．while studying
A．while study
B．for studying
C．studying
D．while studying
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