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.（　?。?/h1>

A．was

B．is

C．had been

D．has been

【答案】D

【解答】

【點(diǎn)評(píng)】

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A．were made	B．have made
C．a(chǎn)re made	D．have been made

A．will be increasing	B．has increased
C．were increasing	D．have increased

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.（ ?。?/h1>