单项选择题


A．lead to
B．open up
C．offer
D．set up
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单项选择题
A．preservedB．observedC．concernedD．reserved
A．preserved
B．observed
C．concerned
D．reserved
单项选择题
A．concerningB．includingC．containingD．involving
A．concerning
B．including
C．containing
D．involving
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