Every minute is made full _________ of ________ our lessons well.

A．use; studying

B．usage; studying

C．use; to study

D．usage; to study

下面6句话分编为4组，全能够表现李密孝敬祖母的一项是(    )

①祖母刘悯臣孤弱，躬亲抚养 ②臣侍汤药，未曾废离

③则刘病日笃；欲苟顺私情 ④但以刘日薄西山，气息奄奄 ⑤母、孙二人，更相为命，是以区区不能废远 ⑥是臣尽节于陛下之日长，报养刘之日短

A．①④⑥

B．②③⑤

C．①③⑥

D．②④⑥