60（）

The second largest stock exchange in the U.S. used to be called .

• A、the Wall Street Exchange

• B、the New York Stock Exchange

• C、the Curb Exchange

• D、the U.S. Exchange

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