题目

“Have you handed in your schoolwork yet?” “Yes, I have. I guess it ______ now.” A. has graded                  B. is graded C. is being graded               D. is grading       答案： C   因为句子的主语it和动词grade是被动的逻辑关系，所以应该使用被动形式，排除 A和D，从时间状语now可以知道应该用进行时.  

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