单项选择题

A．fills
B．be filled
C．filling
D．to fill
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单项选择题
A．applyB．adaptC．takeD．conduct
A．apply
B．adapt
C．take
D．conduct
单项选择题
A．having describedB．describedC．describingD．to have described
A．having described
B．described
C．describing
D．to have described
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