There _________a dramatic rise in the number of extreme weather events over the past 20 years，caused largely by rising global temperatures，according to a new report from the United Nations.（　　）

A．was

B．is

C．had been

D．has been

【答案】D

【解答】

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A．make it clear	B．it has made clear
C．it makes clear	D．has made it clear

There _________a dramatic rise in the number of extreme weather events over the past 20 years，caused largely by rising global temperatures，according to a new report from the United Nations.（ ）