单项选择题
A．are
B．to be
C．be.
D．is
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单项选择题
A．openB．coveredC．secretD．improved
A．open
B．covered
C．secret
D．improved
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单项选择题
A．terminatingB．continuingC．continuesD．terminates
A．terminating
B．continuing
C．continues
D．terminates
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