单项选择题


A．preserved
B．observed
C．concerned
D．reserved
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单项选择题
A．concerningB．includingC．containingD．involving
A．concerning
B．including
C．containing
D．involving
单项选择题
A．liveB．live onC．feed onD．support
A．live
B．live on
C．feed on
D．support
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