单项选择题


A.retain
B.remain
C.maintain
D.refrain
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单项选择题
A.precautionsB.destructiveC.inadequateD.deficient
A.precautions
B.destructive
C.inadequate
D.deficient
单项选择题
A.unanimousB.unimaginableC.unpredictableD.unfortunate
A.unanimous
B.unimaginable
C.unpredictable
D.unfortunate
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