―Look! What a mistake! Why?
―Sorry, I _________ on it.
| A．don’t concentrate | B．hadn’t concentrated |
| C．haven’t been concentrating | D．wasn’t concentrating |
In order to catch up with her classmates, _____.
| A．a lot of books were bought by Mary’s mother |
| B．Mary’s father helped her with her lessons |
| C．Mary worked hard at her lessons around the clock |
| D．Mary’s classmates helped her a lot |
_____ any evidence that Tom ______ games recently?
| A．Is there ;is addicted to play | B．Is it ;addicts to playing |
| C．Has it; addicts to play | D．Is there; is addicted to playing |
Is it in that red building________we can learn and enjoy a rich and colorful life________about 100 Chinese paintings will be on display?
| A．where；that | B．that；where | C．which；that | D．that；which |
It is strongly suggested that measures________students to cheat in the exams.
| A．be taken to prevent | B．be taken to forbid |
| C．are taken to prevent | D．are taken to forbid |
________you were coming，I would have stayed at home.
| A．If I know | B．Should I know | C．Had I known | D．If I should have known |