Up to now nobody able to do this better than Charlie Chaplin.
| A．is | B．has been | C．was | D．will be |
The girl had hardly rung the bell ________ the door was opened suddenly，and her friend rushed out to greet her.
| A．before | B．until | C．as | D．since |
Mary made coffee ________ her guests were finishing their meal.
| A．so that | B．although | C．while | D．as if |
As is reported，it is 100 years ________ Qinghua University was founded.
| A．when | B．before | C．after | D．since |
I'm sorry you've been waiting so long，but it'll still be some time ________ Brian gets back.(2008·北京)
| A．before | B．since | C．till | D．after |
He had no sooner finished his speech________ the students started cheering.(2011·辽宁)
| A．since | B．as |
| C．when | D．than |