单项选择题
A.avoid
B.avoiding
C.to avoid
D.avoided
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单项选择题
A.isB.areC.hasD.have
A.is
B.are
C.has
D.have
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单项选择题
A.usingB.useC.to useD.the use of
A.using
B.use
C.to use
D.the use of
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