单项选择题

A．open
B．covered
C．secret
D．improved
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单项选择题
A．longerB．olderC．weakerD．younger
A．longer
B．older
C．weaker
D．younger
单项选择题
A．involvingB．involvedC．containedD．containing
A．involving
B．involved
C．contained
D．containing
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