–I’m sorry. Mr. Smith. I’ve broken your glasses. --It doesn’t matter. Mark. but

 –I’msorry.  Mr.  Smith.  I’ve broken your glasses. 

--It doesn’tmatter， Mark.  but you___________careful. 

A.  must be      B.should be          C. must havebeen    D. should have been

试题答案

【答案】

 D