The wide spread of super hybrid rice around the world ______ the lives of millions and millions of people suffering from hunger to a great level.
A．has improvedB．is improvingC．improvedD．has been improving
A
考察時(shí)態(tài).句意:全世界廣泛推廣的超級(jí)雜交水稻提高了數(shù)百萬(wàn)經(jīng)受饑餓的人們的生活到了一個(gè)很高的水平.可知描述的是到現(xiàn)在已完成的動(dòng)作,主語(yǔ)為抽象事物,不可數(shù),并且是動(dòng)作的發(fā)出者,故用現(xiàn)在完成時(shí)主動(dòng)語(yǔ)態(tài),選A.
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