_________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |
This problem is said_____ three times at the meeting. However, they haven’t arrived at a conclusion now.
| A．to have discussed | B．to have been discussed |
| C．having been discussed | D．having discussed |
At present there is a fierce debate over the question_______ human cloning should be allowed.
| A．that | B．whether | C．what | D．if |
You have taken a hell of a risk and suffered a great deal, but you should believe it will ____sooner or later.
| A．pay back | B．pay up | C．pay off | D．pay down |
Li Ming was often late for school, ______made our head teacher feel very angry.
| A．when | B．that | C．as | D．which |
.According to the test disciplines it is_______ that any student takes a mobile phone into thee may examination room.
| A．without question | B．beyond question |
| C．out of question | D．out of the question |