The boss thought it would be a good idea to have ______ from his workers to improve his plan.
| A．summaries | B．admissions |
| C．connections | D．comments |
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 |
He smiled politely ________ Mary apologized for her drunken friends.(2012·山东)
| A．as | B．if | C．unless | D．though |
________ we have enough evidence，we can't win the case.
| A．Once | B．As long as | C．Unless | D．Since |