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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