If you can’t understand these sentences, your constant lack of handing in homework .
A. will blame
B. is blamed
C. is to blame
D. is blaming
网友回答
A. will blame
B. is blamed
(答案→)C. is to blame
D. is blaming
解析：考查动词时态。句意：如果你不能理解这些句子的话，是你连续不写作业该受责备。固定短语：be to blame 该受责备，所以C正确。