企源知识库

He is really incompetent! The letter ______ yesterday.
A、should be finished typing
B、must be finished typing
C、must have finished typing
D、should have been finished typing
【正确答案】：D
【题目解析】：should have done 本应该做好（但没有）题意为：他真是无能!这封信昨天就该打完了。