___ is well known is that Africa had contacts with India and the Red Sea civilizations from the earliest times．
| A．As | B．It | C．What | D．That |
Was it during the Spring Break_______ you went on a trip to Suzhou?
| A．when | B．that | C．in which | D．then |
A Belgian French-language daily has released _______ is thought to be Europe’s first 3D newspaper —complete with cardboard viewing glasses.
| A．which | B．where | C．that | D．what |
--- You ________ have bothered doing the washing-up. I could manage it myself.
--- That’s OK, No problem.
| A．wouldn’t | B．mustn’t | C．needn’t | D．couldn’t |
Is it normal that in September hotels near universities are overcrowded, _____ many parents from a distance nowhere to stay but to sleep on the playground ?
| A．to leave | B．left | C．leaving | D．leave |
The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.
| A．be exposed | B．have been exposed | C．exposed | D．be exposing |