A．three hours B．three-hours C．three-hour D．three hour-long
单项选择题A library with five thousand books () to the nation as a gift.
A．is offered B．has offered C．are offered D．have offered
单项选择题The doctor insisted that he () seriously ill and that he()operated on immediately.
A．be; should be B．was; be C．was; must be D．should be; should be
