How many times______ not to play with fire?
－I’m sorry. I’ll never do that again.
| A．do you tell | B．had you told | C．are you told | D．have you been told |
It’s high time we our attention to this problem．
| A．turned |
| B．turn |
| C．had turned |
| D．would turn |
It’s necessary that he a recognized qualification .
| A．has |
| B．have |
| C．had |
| D．having |
We demanded that we of any change in the plan.
| A．informed |
| B．would be informed |
| C．be informed |
| D．had been informed |
--- John went to the hospital alone.
--- lf he me about it ，I would have gone with him (2010 .天津)
| A．should tell |
| B．tells |
| C．told |
| D．had told |
Maybe if I science, and not literature then, l would be able to give you more help. (2011 .北京 )
| A．studied |
| B．would study |
| C．had studied |
| D．was studying |