单项选择题
A.have
B.are
C.will be
D.is
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单项选择题
A.billionthsB.billionC.billionaireD.billionth
A.billionths
B.billion
C.billionaire
D.billionth
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单项选择题
A.catalogueB.listC.tableD.sheet
A.catalogue
B.list
C.table
D.sheet
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