A．I know B．I knew C．do I know D．did I know
单项选择题（） new employee feels insecure during （） first few weeks on the job.
A．Many ...their B．Many...his or her C．Many a ...their D．Many a...his or her
单项选择题The room is in a terrible mess; it （） cleaned.
A．mustn't have been B．shouldn't have been C．can't have been D．wouldn't have been
