单项选择题
A.steep
B.gental
C.flat
D.stiff
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单项选择题
A.unlessB.ifC.asD.since
A.unless
B.if
C.as
D.since
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单项选择题
A.AlthoughB.SinceC.BecauseD.Therefore
A.Although
B.Since
C.Because
D.Therefore
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