问题补充：
—Have you handed in your school-work yet?
—Yes, I have. I guess itnow.
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：考查时态语态：句意：你的作业交了吗？--是，已经交了，我猜现在正在被批改。因为时间是now，而且school-work和grade是被动关系，用现在进行时的被动语态，选C。
