高中英语动词语态试题

Over the past decades, sea ice     in the Arctic as a result of global warming.

A．had decreased

B．decreased

C．has been decreasing

D．is decreasing

With the help of high technology, more and more new substances ______ in the past years.

A．discovered	B．have discovered
C．had been discovered	D．have been discovered

I got caught in the rain and my suit _______.

A．has ruined	B．had ruined
C．has been ruined	D．had been ruined