Gun control is a subject _______ Americans have argued for a long time. (2009 ,陕西)
| A．of which |
| B．with which |
| C．about which |
| D．into which |
I’ll come after the meeting if time ______.
| A．permits | B．is permitting |
| C．is permitted | D．has permitted |
New medicines and instruments ______ every day to extend life.
| A．develop | B．are being developed |
| C．are developing | D．have developed |
What I wanted to know was when and where the meeting ______.
| A．was holding | B．had held |
| C．was to hold | D．was to be held |
If you go there alone after dark you might get _____.
A. attacked and robbed B. attacking and robbing
B. to attack and rob D. to be attacked and robbed
A red sky in the morning _____ to be a sign of bad weather.
| A．says | B．is saying |
| C．has said | D．is said |