问题补充：
一Have you handed in your schoolwork yet?
一Yes,I have.I guess it now.
A. has graded
B. is graded
C. is being graded
D. is grading
答案：
A. has graded
B. is graded
(答案→)C. is being graded
D. is grading
解析：这道题可谓一箭“三”雕，即考查了时态、语态和词的转
换。从now可知，我的作业正在被老师批改，所以要用一般
现在时的进行时的被动语态。这里的grade是由名词“等级；
成绩”转换为动词“评阅”。故答案为C.
