单项选择题
A.Have
B.Had
C.Having
D.Had been
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单项选择题
A.ontoB.onC.offD.in
A.onto
B.on
C.off
D.in
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单项选择题
A.ensureB.certainC.sureD.surely
A.ensure
B.certain
C.sure
D.surely
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