_菏泽成人高考

56（）

The room is in a terrible dirty surroundings;it_____ cleaned.（）

• A、can’t have been

• B、shouldn’t have been

• C、mustn’t have been

• D、wouldn’t have been

.Many people don’t know that_____.

• A、twins understand each other very well

• B、twins are slow to learn to talk

• C、twins are unlikely to do less well at school than other children

• D、there exists more communication between twins