2.—__________ you see those people on that little sandy island?They __________ handkerchiefs for the last half hour.I wonder why.
—They need help.The tide’s coming in and very soon that little island will be under water.
A.Do;have been waving
B.Did;have been waving
C.Do;had been waving
D.Did;had been waving
解析:选A。句意:——你看见小沙洲上的那些人了吗?半小时了,他们一直挥舞着手绢。我不知是怎么回事。——他们需要救援。潮水正在上涨,不一会儿那小岛就要被淹没。根据时态第一空采用一般现在时。现在完成进行时表示一个过去开始、现仍在继续的动作,所以第二空采用现在完成进行时。
3.Cathy is taking notes of the grammatical rules in class at Sunshine School,where she __________ English for a year.
A.studies
B.studied
C.is studying
D.has been studying
解析:选D。根据主句所说明的,Cathy现在仍在这个学校学习,故应用现在完成进行时。
4.Over the past decades,sea ice________in the Arctic as a result of global warming.
A.had decreased
B.decreased
C.has been decreasing
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