单项选择题

A．which
B．what
C．that
D．/
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单项选择题
A．having describedB．describedC．describingD．to have described
A．having described
B．described
C．describing
D．to have described
单项选择题
A．inB．onC．underD．beyond
A．in
B．on
C．under
D．beyond
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