-I'm sorry I'm late again But I…．
-It's 'no use . It's the third time that You came late this week
A. plain
B. plained
C. to plain
D. plaining
网友回答
A. plain
B. plained
C. to plain
(答案→)D. plaining
解析：句意：上文，很抱歉我又迟到了，但是我……。下文，抱怨是没用的。这星期，你已经是第三次迟到了。It's 'no use doing sth ,这是固定句型，意思是做某事是没用的，选D。