the exam to test the students'ability of memory是主语,当然用end作谓语,at last可见是过去式,所以用ended.ending不能单独做谓语.
既然有了主谓语,那么后面的make就只能做非谓语动词了.因为同主语之间的关系是主谓关系,所以用make的ing形式.
the exam to test the students'ability of memory _______at la
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