--- Look!Somebody ___ the sofa.
--- Well,it wasn’t me. I didn’t do it.
| A．is cleaning | B．was cleaning |
| C．has cleaned | D．had cleaned |
In 1939, Hitler ______ war against Poland, which started the Second World War.
| A．announced | B．acknowledged | C．declared | D．stated |
He is more than happy to keep you ____ company, which is just out of _____ question.
| A．a; / | B．a; the | C．the; the | D．/; / |
---Shall we go to the art exhibition right now?
--- ____________.
| A．It’s your opinion | B．I don’t mind |
| C．It’s all up to you | D．That is your decision |
—He failed in the exam again.
—He __________his teacher’s advice.
| A．should not have followed | B．should not follow |
| C．mustn’t follow | D．should have followed |
When first to the market, these products enjoy great success.
| A．introducing | B．introduced | C．introduce | D．being introduced |