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531.Over the past decades,sea ice ______ in the Arctic as a result of global warming.
A.had decreased
B.had been decreased
C.has decreased
D.has been decreased
532.Look!How long ______ like this?
Three weeks!It's usual here that rain _______ without stopping these days of the year.
A.has it rained;pours
B.has it been raining;pours
C.is it raining;is pouring
D.does it rain;pours
