His writing is so confusing that it’s difficult to make out _____it is he is trying to express.
| A．that |
| B．how |
| C．who |
| D．What |
He ______ articles for our wall-newspaper these three years, and he ______ about forty articles.
| A．has been writing; has written |
| B．has been writing; wrote |
| C．is writing; has been writing |
| D．has written; has written |
--- ______ Betty this morning?
--- Not yet, but she is sure to be here before noon.
| A．Have you seen | B．Will you see |
| C．Do you see | D．Did you see? |
--- Is Tom still smoking?
--- No. By next Saturday he ______ for a whole month without smoking a single cigarette.
| A．will be | B．will have gone |
| C．will have been | D．has been going |
The vegetables didn’t taste very good. They ______ too long.
| A．had been cooked | B．were cooked |
| C．have cooked | D．cooked |
I used to drink a lot of tea but these days I ______ coffee.
| A．prefer | B．preferred |
| C．had preferred | D．am preferring |