单项选择题


A.If
B.Although
C.Because
D.Since
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单项选择题
A.selectionsB.collectionsC.sourcesD.origins
A.selections
B.collections
C.sources
D.origins
单项选择题
A.plentifulB.limitedC.irregularD.flexible
A.plentiful
B.limited
C.irregular
D.flexible
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